Limoncello is an Italian lemon liqueur made by steeping lemon peels, with the pith removed, into a strong vodka or ethanol until the lemon oils are released. It is then strained and mixed with simple syrup. A traditional tiramisu has espresso and dark rum or marsala. Tiramisu literally means 'pick me up' or 'lift me up,' likely a nod to the espresso in it.