Place one cake layer upside down (flat bottom up) on a cake plate. Spread the Strawberry Cupcake Filling or jam over this cake layer, not quite to the edges.
Set the second layer over the filling, top side up. (You should end up with the two flat bottoms of the cake layers meeting in the middle.)
Frost the cake. First, spread a thin layer of frosting on the sides. Then, frost the top and spread a second layer over the sides, so that no cake crumbs show.
Decorate the cake by arranging some sliced, fresh strawberries in the middle. Pop a few whole berries on the side, if you have any more.