This mocha sauce was incredible. It should be illegal.
2 squares (2 ounces) unsweetened chocolate
1/3 cup water
1/2 cup granulated sugar
1 tablespoon instant coffee
3 tablespoons butter or margarine
1/4 teaspoon vanilla extract
Microwave the chocolate and water in a large microwavable bowl on High for 1 1/2 minutes. Stir until the chocolate is completely melted.
Stir the sugar and instant coffee into the chocolate mixture. Microwave for 1 minute. Stir. Microwave for 2 minutes longer. Stir in the butter and vanilla. Serve warm over ice cream, pudding, or cake. Store the leftover sauce in the refrigerator. Reheat before serving.
Makes about 1 cup. Source: Maxwell House Coffee Drinks & Desserts Cookbook.