Olive oil is one of the bases of Portuguese cuisine, which is used both for cooking and flavouring raw meals. This has led to a unique classification of olive oils in Portugal, depending on their acidity: 1.5 degrees is only for cooking with (virgin olive oil), anything lower than 1 degree is good for dousing over fish, potatoes and vegetables (extra virgin). 0.7, 0.5 or even 0.3 degrees are for those who do not enjoy the taste of olive oil at all, or who wish to use it in, say, a mayonnaise or sauce where the taste is meant to be disguised.