Olive oil, the treasure of Mediterranean

Olive oil, often regarded as liquid gold, holds a significant place in the Mediterranean region, both culturally and economically. This multifaceted oil is extracted from the fruit of the olive tree, a species that thrives in the warm climate of the Mediterranean basin. For centuries, olive oil has been a staple in Mediterranean diets, praised not only for its flavor but also for its numerous health benefits. Understanding the history, production, and cultural importance of olive oil reveals why it is considered a treasure of the Mediterranean.

 

This webquest will take you on a journey to explore the fascinating world of olive oil! Get ready to learn about its rich history, discover its amazing health benefits, and even become a scientist yourself!

STEP 1: OLIVE OIL PRESENTATION

The introduction to the topic and our objectives will be made with the use of an interactive presentation including:

• The history of olive tree and olive oil
• Producing and prcessing methods
• Its nutritional value
• Its uses and health benefits
• Its cultural importance

https://view.genially.com/66a7d47d310c3c11d6ac1a44/presentation-olive-oil-the-treasure-of-mediterranean

At the end students are encouraged to take part in a Kahoot quiz, and provide evidence on the cultural importance of olive oil to their region (e.g. festivals, religional aspects, etc) in the following padlet:

STEP 2: RESEARCH AND COMPARISON

Students in transnational teams will research and present on the nutritional benefits of olive oil compared to other oils and fats, so to develop research skills and understanding of nutritional science.

TEAM A: OLIVE OIL AND SUNFLOWER OIL

TEAM B: OLIVE OIL AND COCONUT OIL

TEAM C: OLIVE OIL AND BUTTER

TEAM D: OLIVE OIL AND MARGARINE

They present their findings to a twinboard on Twinspace (ESEP Platform)

Worksheet: https://docs.google.com/document/d/1g4f4L8CDgYAO3V-jo-bnMu8cK2SEUgLojc0Z9HhJY4g/edit?usp=sharing

STEP 3: TASTING SESSION

Students will sample different types of olive oil: a range from extra virgin to refined, and even flavored varieties so to teach them how to distinguish between different qualities and flavors of olive oil.

• Materials Needed: Various types of olive oil, small tasting cups, bread or plain crackers, tasting notes sheet.

STEP 4: STEM ACTIVITIES

1. Soap Making:

Objective: Teach students the basic principles of saponification and the practical uses of olive oil.

We'll show a short video on the traditional process of making olive oil soap:

https://www.youtube.com/watch?v=02boZ5FPJW4

 

Materials Needed:

• Safety Gear: Gloves, goggles, and aprons
• Ingredients:
  • Olive oil (500 ml)
  • Coconut oil (200 ml)
  • Lye (sodium hydroxide) (100 g)
  • Distilled water (250 ml)
  • Essential oils (optional, for fragrance)
  • Natural colorants (optional, e.g., turmeric, cocoa powder)
• Equipment:
  • Digital scale
  • Heat-resistant glass or stainless steel bowls
  • Stainless steel spoon or spatula
  • Stick blender
  • Soap molds
  • Thermometer
  • Measuring cups and spoons
  • Parchment paper
  • Plastic wrap
  • Labeling materials

1. Divide students into small groups. Have each group measure out the olive oil, coconut oil, lye, and distilled water..Discussion: Explain the role of each ingredient in the soap-making process.
2. Show how to slowly add lye to water (never water to lye) and mix until fully dissolved. Allow the solution to cool to around 100°F (38°C). Have students heat the olive oil and coconut oil mixture to the same temperature (100°F) in a heat-resistant bowl. 
3. Demonstrate how to combine the lye solution with the oils and use a stick blender to blend until "trace" is reached (the mixture thickens and leaves a trail when drizzled on the surface).
4. Optional: Allow students to add essential oils and natural colorants to their soap mixture, stirring thoroughly.
5. Have students pour their soap mixture into molds lined with parchment paper. Show how to smooth the tops and cover the molds with plastic wrap. 
6. Discuss the curing process, explaining that the soap needs to sit undisturbed for 24-48 hours until it hardens enough to unmold. Inform students that the soap will need an additional 4-6 weeks to cure completely, allowing the lye to neutralize fully.
7. In the next day (once it has hardened), demonstrate how to carefully unmold and cut the soap into bars.
8. Optional: Allow students to create labels with the ingredients, date made, and any special notes.
9. Discussion: Reflect on the process, the benefits of olive oil in skincare, and how traditional practices can be integrated into modern routines.

 

2. Oil Quality Analysis:

Objective: Educate students on the chemical properties and quality indicators of olive oil, by measuring the acidity of different olive oil samples.

Materials Needed:

• Safety Gear: Gloves, goggles, and aprons
• Chemicals:
  • Phenolphthalein indicator solution
  • Sodium hydroxide (NaOH) solution (0.1 N)
  • Ethanol
• Equipment:
  • Burette
  • Burette stand
  • Pipette (10 ml)
  • Erlenmeyer flask (250 ml)
  • Measuring cylinder (100 ml)
  • Olive oil samples (extra virgin, virgin, and regular)
  • Distilled water
  • Calculator
  • Notebooks and pens

Explain what acidity in olive oil means and why it is an important measure of quality. Discuss the different grades of olive oil (extra virgin, virgin, and regular) and their acidity levels, by using the video:

https://www.youtube.com/watch?v=TaN1CimEqfY

Divide students into small groups. Have each group set up their burette, ensuring it is clean and free of any air bubbles. Explain the titration process and the role of each chemical used in the experiment.

• Step-by-Step Procedure:

  1. Measure Olive Oil: Pipette 10 ml of the olive oil sample into an Erlenmeyer flask.
  2. Add Ethanol: Add 50 ml of ethanol to the flask. This helps dissolve the oil for the titration.
  3. Add Indicator: Add 2-3 drops of phenolphthalein indicator to the mixture in the flask.
  4. Titrate: Fill the burette with 0.1 N sodium hydroxide solution. Slowly add the NaOH solution to the flask while constantly swirling until a persistent pink color appears, indicating the endpoint.
  5. Record Volume: Record the volume of NaOH solution used to reach the endpoint.

• Calculation:

  • Use the following formula to calculate the acidity: Acidity (%)=[(Volume of NaOH (ml)×Normality of NaOH×28.2)/Weight of olive oil sample (g))]×100
  • Have students calculate the acidity for each sample and compare results across different olive oil types. Compare the calculated acidity levels with the standards for extra virgin, virgin, and regular olive oils. Discuss how acidity affects the flavor, quality, and health benefits of olive oil. 

3. Field Trip

1. Visit to an Olive Oil Mill:
   • Activity: Organize a field trip to a local olive oil mill or invite an olive oil producer to speak to the class.
   • Objective: Provide students with a real-world perspective on olive oil production.

Olive Oil Cultural importance Rubric

Criteria	1 - Needs Improvement	2 - Fair	3 - Good	4 - Very Good	5 - Excellent
Engagement and Interaction	No interaction with the audience; presentation is monotonous.	Minimal audience engagement; some interaction attempted.	Engages the audience occasionally; interaction is limited.	Actively engages the audience with questions and discussions.	Exceptionally engaging presentation; audience participation is encouraged and facilitated.
Cultural Importance Evidence	No evidence provided; lacks relevance.	Minimal evidence provided with little connection to the topic.	Some relevant evidence presented; connection is somewhat clear.	Strong evidence and relevance to cultural importance is evident.	Comprehensive and compelling evidence showcasing the cultural importance of olive oil in the region.

Research and Comparison Presentation Rubric

Criteria	1 - Needs Improvement	2 - Fair	3 - Good	4 - Very Good	5 - Excellent
Research Depth	Minimal research; lacks key information.	Basic research presented; lacks depth.	Adequate research with some relevant information.	Strong research with detailed comparisons.	Comprehensive research; insightful comparisons and analysis.
Team Collaboration	No evidence of teamwork; disjointed presentation.	Some collaboration; presentation lacks coherence.	Adequate collaboration; generally smooth presentation.	Strong teamwork evident; coherent presentation.	Exceptional collaboration; seamless presentation with clear roles.
Presentation Skills	Poor delivery; lacks confidence and clarity.	Basic delivery; some clarity but lacks engagement.	Good delivery; engages the audience adequately.	Very good delivery; confident and engaging.	Exceptional delivery; highly engaging and confident, captivates the audience.
Use of Data	No data used; lacks analysis.	Minimal data used; limited analysis.	Some data presented; basic analysis provided.	Strong data usage with good analysis.	Excellent and insightful use of data; thorough analysis and implications discussed.
Visual Presentation	Visuals are absent or ineffective.	Visuals are present but poorly designed.	Some effective visuals; supports understanding.	Effective visuals that enhance the presentation.	Outstanding visuals that are engaging, relevant, and significantly enhance the presentation.

Tasting Session Rubric

Criteria	1 - Needs Improvement	2 - Fair	3 - Good	4 - Very Good	5 - Excellent
Preparation and Setup	Poorly prepared; disorganized setup.	Some preparation evident; incomplete setup.	Adequately prepared; setup is mostly complete.	Well prepared; setup is organized and effective.	Exceptionally prepared; thorough setup with attention to detail.
Participation and Engagement	No participation; disengaged.	Minimal participation; some engagement attempted.	Some participation; moderately engaged.	Actively participates and engages with others.	Fully engaged; encourages and facilitates participation from all.
Tasting Notes and Reflection	No notes taken; no reflection shared.	Minimal notes; reflection lacks depth.	Adequate notes taken; basic reflection shared.	Strong notes and thoughtful reflections shared.	Comprehensive notes and insightful reflections; encourages discussion.
Understanding of Olive Oil Qualities	Lacks understanding of different olive oils.	Basic understanding; limited distinctions made.	Adequate understanding; some distinctions made.	Strong understanding; clear distinctions among olive oils.	Exceptional understanding; insightful analysis of olive oil qualities and flavors.

STEM Activities Rubric

Criteria	1 - Needs Improvement	2 - Fair	3 - Good	4 - Very Good	5 - Excellent
Understanding of Saponification	Lacks understanding of the process.	Basic understanding; significant gaps.	Adequate understanding; some key concepts clear.	Strong understanding; clear explanation of the process.	Exceptional understanding; in-depth knowledge and insights shared.
Safety Procedures	No safety procedures followed.	Minimal safety practices evident.	Basic safety practices followed.	Strong adherence to safety protocols.	Outstanding commitment to safety; all procedures followed meticulously.
Group Collaboration	No collaboration evident; disjointed experience.	Minimal collaboration; lacks coherence.	Adequate collaboration; generally smooth process.	Strong collaboration evident; coherent teamwork.	Exceptional collaboration; seamless integration of all group members' contributions.
Quality of Final Product	Final product is poorly made and lacks quality.	Some quality evident, but significant flaws.	Adequate quality; some strengths and weaknesses.	Strong quality; well-made product with minor flaws.	Exceptional quality; product exceeds expectations and demonstrates mastery.
Reflection on Process and Benefits	No reflection shared; lacks relevance.	Minimal reflection; limited insights.	Adequate reflection shared; basic insights provided.	Strong reflections with thoughtful insights shared.	Comprehensive and compelling reflections that connect the process with benefits and traditional practices.

 

Olive oil is much more than a cooking ingredient; it is a symbol of Mediterranean culture, history, and health. Its rich heritage and the meticulous process of production contribute to its status as a treasure of the Mediterranean. As we continue to explore the benefits of olive oil, it is essential to recognize its role in promoting health and preserving traditional practices. Embracing olive oil in our diets not only enhances our meals but also connects us to a history that spans millennia, celebrating the land and the people who have cultivated this remarkable oil.

This WebQuest was edited by one of the teachers of 1st EPAL Nafpaktou, Greece, as part of the activities of the "Mediterranean Diet for Overall Health" (MedDiet4Health) Erasmus+ project (Project number: 2023-2-EL01-KA210-VET-000183592).

These activities collectively foster a comprehensive understanding of olive oil, while developing valuable skills in research, analysis, collaboration, and practical science.

This WebQuest reflects only the author’s views. The European Commission’s support for the production of this WebQuest does not constitute an endorsement of the contents which reflects the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein.