Instructions: Combine sugar, cocoa, cornstarch and instant coffee in a medium saucepan.

Gradually stir in the milk. Bring the mixture to a boil over medium heat stirring constantly, until it thickens. Remove from heat and stir in margarine and vanilla; keep stirring until margarine is melted. To serve, scoop 1/2 cup frozen yogurt into individual serving bowls, and top evenly with hot fudge sauce.

Preparation and heating time: 10 minutes

Yield: 8 sundaes

Serving size: 1 sundae ( 1/2 cup frozen yogurt with about 2 tablespoons sauce)

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