10 oz. pkg. frozen whole strawberries, thawed slightly
1/2 c. sugar
1.4 oz. pkg. whipped topping mix, prepared according to pkg. directions
1/2 to 1 c. plain yogurt

Combine strawberries and sugar in blender; puree. Add whipped topping and yogurt. Pour mixture into an 8 inch metal pan. Freeze for several hours. Serves 8.