No Bake Rainbow Pie

No Bake Rainbow Pie 1 graham pie crust 1 can sweetened condensed milk 6 tablespoons lemon juice (approx. 2 whole lemons) 1 14 oz can crushed pineapple, well drained 1 cup whipped topping (such as cool whip) 3 1/2 cups fruit flavored mini marshmallows extra whipped topping for garnish (optional) In a bowl, whisk together condensed milk and lemon juice. Fold in remaining ingredients. Heap filling into the pie crust and refrgerate 4 hours or overnight.