Hot Fudge Sauce

3/4 Cup sugar
1/2 Cup cocoa
1/2 Cup 2 tablespoons evaporated milk (5 ounce can)
1/3 Cup light corn syrup
1/3 Cup margarine
1 Teaspoon vanilla
In small saucepan combine sugar and cocoa; blend in evaporated milk and corn syrup. Cook over medium heat, stirring constantly, until mixture boils; boil and stir margarine and vanilla. Serve warm. Makes about 1 3/4 cups sauce