Process basil leaves and olive oil or tomato sauce in a food processor until basil is finely chopped. Spoon mixture into ice-cube trays, and freeze. Store frozen cubes in freezer bags up to 6 months.
Use anywhere you need a burst of fresh basil flavor: in soups, sauces, or salad dressings. Thaw and add to marinades, or drizzle over grilled meats and vegetables.
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