Try this...
1 envelope unflavored gelatin
3/4 cup milk
1/3 cup sugar
1 1/4 cups plain yogurt
1 cup sliced strawberries, fresh or frozen and thawed
1 tablespoon kirsch (optional)
What to Do
In a saucepan, sprinkle gelatin over milk and let stand for 1 minute.
Sprinkle gelatin onto liquid, never the other way round. Always give gelatin a few minutes to swell before heating.
Stir in sugar and set over moderately low heat, stirring, about 2 minutes, until dissolved.
Transfer the mixture to a large bowl and whisk in the yogurt. Fold in the strawberries and kirsch, if using.
Freeze.