Add Jello boiling water in a small pan and stir over low heat until dissolved. Stir in sugar and lemon juice and stir until sugar is dissolved. Turn yogurt into a bowl and beat until smooth. Beat into it the Jello mixture.
Pour into a pan, chill and cut into squares to serve, or pour into individual molds.
Serve on a lettuce leaf with fresh fruit.
Serve salad dressing of your choice.
Serves four to six, or fills five individual molds.