3/4 cup boiling water
1 (3 ounce) package lemon flavored gelatin mix
1 (8 ounce) container low-fat lemon yogurt
1/2 cup creamy salad dressing (e.g. Miracle Whip)
1 cup frozen whipped topping, thawed
1 (9 inch) prepared graham cracker crust
2 tablespoons raspberry preserves, heated