Spicy Peanut Sauce

• 2 tablespoons vegetable oil
• 3 scallions, chopped fine
• 1 garlic clove, chopped fine
• 1 tablespoon finely grated peeled fresh gingerroot
• 1 cup water
• 1/2 cup creamy or chunky peanut butter
• 1/4 cup soy sauce
• 1/4 cup distilled white vinegar
• 3 tablespoons firmly packed brown sugar
• 1/4 teaspoon dried hot red pepper flakes

In a saucepan heat oil over moderate heat until hot but not smoking and cook scallions, garlic and ginger, stirring, until fragrant, about 1 minute. Stir in remaining ingredients and bring to a simmer, stirring. Simmer sauce, stirring, until smooth and cool to room  temperature. Sauce may be made up to 3 days ahead and chilled, covered. If sauce is too thick after chilling, stir in 1 to 2  tablespoons hot water until sauce reaches desired consistency.