In a food processor combine the ricotta cheese, cream cheese, 1/4 cup of the sugar, half of the orange zest, and the egg. Blend until smooth. Lightly grease the sides of the mini muffin tin with butter. Fill the cups with about 1 1/2 tablespoons of the cheesecake mixture. Place the mini muffin tin in a baking dish and pour enough hot water in the baking dish to come halfway up the sides of the mini muffin tin. Bake for 25 minutes. Transfer the mini muffin tin to a wire rack and let cool for 30 minutes. Refrigerate for 15 minutes. Use a small knife to gently pop the cheesecakes out of the cups.