Toddler Lunchbox Idea: Turkey & Cheese Uncrustable, Veggies, Apples & Granola Butter Apple Browning Tip* To prevent apples from browning, mix together 1 cup of water with 1/2 teaspoon of salt and soak apple slices in this mixture for 5 minutes. Rinse the apples well, pat them dry well, and they will stay fresh in the fridge in an airtight container for 3-4 days. toddlerlunch lunchboxideas