Beautiful, fresh blueberries top a yummy buttery cake with a hint of lemon. The blueberry topping is jammy and sweet, but not too sweet, just perfect! Use fresh berries if you can, but frozen will work. It's important that the buttermilk is room temperature, so it mixes well with the butter and as always, the egg and butter should be room temperature. Another tip is to not overbeat while adding in the flour. I know you'll love this recipe! Don't forget the vanilla ice cream or whipped cream for serving!