Overview

Olive oil is the liquid fat extracted from the fruit of the olive tree (Olea europaea), a crop native to the Mediterranean Basin. It consists primarily of oleic acid (up to 83%) with smaller amounts of linoleic and palmitic acids. The flavor ranges from grassy and peppery to buttery and mild, depending on the olive variety, ripeness at harvest, and processing method.

Origin and history

The olive tree was first domesticated in the Eastern Mediterranean around 6000 to 5000 years ago, with evidence of cultivation in Crete, Syria, and Palestine by the Bronze Age [1]. Olive oil became a central commodity in Minoan, Greek, and Roman economies, used for cooking, lighting, medicine, and religious ritual. By the Roman period, olive oil was traded across the empire, with amphorae from Baetica (modern Andalusia) found as far north as Britain [2]. After the Islamic conquest of the Mediterranean, olive cultivation spread into North Africa and Iberia, where it remains a major agricultural product. The oil was introduced to the Americas via Spanish and Portuguese colonization in the 16th century [3].

Varieties and aliases

  • Extra virgin olive oil (EVOO): cold-pressed, no chemical treatment, acidity below 0.8%
  • Virgin olive oil: cold-pressed, acidity below 2%
  • Refined olive oil: chemically or physically treated to neutralize flavor and acidity
  • Pure olive oil: a blend of refined and virgin oils
  • Olive pomace oil: extracted from the leftover pulp using solvents, then refined
  • Arbequina: small, fruity Spanish variety
  • Picual: peppery, high-polyphenol Spanish variety
  • Koroneiki: small, high-yield Greek variety
  • Frantoio: classic Tuscan variety, grassy and bitter
  • Mission: the dominant variety in California, brought by Spanish missionaries

Culinary uses

Olive oil is used for frying, sautéing, roasting, dressing salads, and finishing dishes. Extra virgin oil is typically reserved for raw or low-heat applications where its flavor is not degraded. In Mediterranean cuisines, it is the primary cooking fat for vegetables, legumes, fish, and meats. It is also used in baking, as a base for marinades and vinaigrettes, and as a preservative for cheeses and cured vegetables. The smoke point of extra virgin olive oil is approximately 190 to 210°C (375 to 410°F), making it suitable for moderate-heat cooking [2].

Cross-cuisine context

Olive oil has no direct analogue in traditional Mexican cuisine, where lard, vegetable shortening, and seed oils (corn, sunflower) are the dominant fats. However, in the LA context, olive oil appears across multiple diaspora cuisines. In Armenian cooking, it is used for cold and Lenten preparations, salads, and dishes from the Aleppo and Beirut Armenian traditions, with Lebanese and Syrian oils preferred for their fruity, peppery character. In Persian cuisine, olive oil is used in marinades for kababs (such as joojeh), in Salad Shirazi dressings, and as a finishing drizzle on lentil dishes like adasi. In Arabic cuisine, olive oil is foundational: it is drizzled over hummus and labneh, used to saturate the bread base of musakhan, and mixed into za’atar for manakish. In Russian Orthodox tradition, olive oil is permitted during Lenten fasting periods as a plant-based fat.

Notes for cooks

  • Extra virgin olive oil should be stored in a cool, dark place away from heat and light to prevent rancidity. Do not refrigerate; condensation can degrade flavor.
  • For high-heat frying, refined olive oil or a blend is more stable than extra virgin due to its higher smoke point and neutral flavor.
  • Color is not a reliable indicator of quality. Green oils often indicate early harvest and higher polyphenol content, but golden oils can be equally high quality.