Shop › Sunnyside Lemon Image 1 of 1 Sunnyside Lemon $62.00 Bright lemon sponge, lemon curd fill & lemon-zest Swiss meringue buttercream. Key ingredients: All-purpose flour, Granulated sugar, Baking powder, Fine sea salt, Unsalted butter, room temp, Eggs, room temp. Sold by the dozen. Add To Cart Added! Bright lemon sponge, lemon curd fill & lemon-zest Swiss meringue buttercream. Key ingredients: All-purpose flour, Granulated sugar, Baking powder, Fine sea salt, Unsalted butter, room temp, Eggs, room temp. Sold by the dozen.