This sensational summer fruit crisp is a crowd-pleasing dessert. Sliced fruit is tossed with sugar and topped with a flour and butter mixture before being baked. In the oven, the fruit begins to soften and release its juices while the topping because golden brown and crispy. You can use whatever fruit is available in your farmer's market for this recipe. A combination of plums, nectarines, and berries are absolutely delicious. Serve this summer fruit crisp with vanilla ice cream and freshly whipped cream.