Cut your fruit and pile it all into a big bowl.
In a small bowl, whisk the yogurt, brown sugar, and zest together until the brown sugar has dissolved and the whole thing smells like citrus.
Either fold the dressing gently into the fruit, or serve it on the side and let people spoon it on. (Side is better if you're not eating it all right away; see the notes.)
Chill for a bit if you have time. Serve cold.