The slightly bitter tang of the marmalade in the buttercream is enough to splice through the richness of the biscuit and filling, and as it melts on your tongue, you’ll find yourself having a moment, too.
If you’re looking for a simple seafood dish that really hits the spot, this is it. If you can’t find vongole or clams, use mussels instead. Or swap them for some firm fish or a different meat — perhaps bacon or Italian sausage.