Diabetic Pineapple Sherbet

1 (16 oz.) can crushed pineapple in pineapple juice
1 tsp. unflavored gelatin (1/3 envelope)
2 tbsp. lemon juice nonnutritive sweetener equivalent to 1/2 cup sugar
1/2 c. nonfat dry milk powder

At least 3 1/2 hours before serving: Drain pineapple, reserving juice.
In small saucepan, into 1/4 cup reserved pineapple juice, sprinkle gelatin.
Cook over low heat, stirring constantly until gelatin is dissolved.
Remove from heat; stir in 1/2 cup reserved pineapple juice, lemon juice, crushed pineapple and nonnutritive sweetener.
Cool.
In small bowl with mixer at high speed, beat milk powder with 1/2 cup ice water until stiff peaks form, gently stir in gelatin mixture until well combined.
Pour into shallow pan; freeze 3 hours or until firm.