Pipe or spread the buttercream onto the loaf cake, then sprinkle over the blueberries and lime zest. The blueberries can be swapped for any other berry you like, such as raspberries or blackberries.
a barely sweet blueberry mascarpone filling, American buttercream, or a french meringue. Add a couple of teaspoons of vanilla extract for extra flavor. Plus, these different blueberry-filled ...