Add whipped topping, lime zest, 1 Simply Desserts Lime Jel sachet, lime juice, and green food coloring to a stand mixer and whip on medium. If the mixture looks too thick, add a splash of milk and whip again. The lime filling should be fluffy frosting consistency.
1 Sachet Simply Desserts Lime Jel, 8 oz whipped topping, Splash of milk, Green food coloring, Juice of ½ lime