No matter what your climate or location might be, this simple recipe will turn your home into a tropical paradise. Let's whip up a classic key lime pie. A democratic blend of tangy and sweet, Key Lime Pie is a tasty way to end a meal. Watch how to make a classic Key Lime Pie at home. Ingredients needed are graham cracker pie crust, egg yolks, sweetened condensed milk, grated lime zest and key lime juice, fresh or bottled. If you can not find key lime juice in your grocery store, general lime juice is a close match.