Pistou is an olive oil--based basil sauce from the south of France that closely resembles Ligurian pesto. There's only one way to make true pistou--by hand. Tear the basil leaves into pieces first, then grind the leaves against the side of a mortar with a pestle to puree them into a silky, creamy sauce. Like its Italian twin, pistou can also be served as an accompaniment to grilled meats, poultry, fish and vegetables.
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