Blueberry Fizz

Tonight I mixed this for D., from scratch, given what we had in the refrigerator and on the shelf.

In a mixing glass, muddle eight blueberries with the juice of one key lime and one teaspoon of granulated sugar. Shake with eight ounces of seltzer. Crush ten or so cubes of ice, and fill the glass. Pour the mixed drink over the ice, and garnish with blueberries.