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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