Spread a thin layer of raspberry jam over each cupcake and then spread or pipe lemon buttercream or frosting on top.
*I keep lemon oil on hand and always use it in place of zest. It is pressed from lemon peel, so it is the substance that gives lemon zest its flavor and is extremely strong. Be very careful not to overdo this ingredient, as you can ruin a whole batch that way. If you taste the batter and feel that it's not lemony enough, add additional oil literally drop by drop. Citrus oils last forever in the fridge.