Makes 3/4 cup
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2 tablespoons butter or margarine
1 (1-ounce) square unsweetened chocolate
1 cup sifted powdered sugar
2 tablespoons boiling water
Combine butter and chocolate in a small heavy saucepan. Cook over low heat until chocolate melts. Cool 3 to 4 minutes. Add sugar and water; beat until smooth, using a wooden spoon.