Combine cornstarch and mustard in a 2-cup glass measure. Gradually add milk and egg substitute, blending with a wire whisk. Microwave at High 1 minute; stir well.

Microwave at High an additional 1-1/2 minutes or until thickened, stirring every 30 seconds. Add lemon juice, margarine, and salt; stir with a wire whisk. Yield: 1 cup (serving size: 1 tablespoon).

Per serving: 242 Calories; 13g Fat (47% calories from fat); 9g Protein; 23g Carbohydrate; 7mg Cholesterol; 499mg Sodium