The term 'ESPRESSO FOAM' is a combination of two words, 'ESPRESSO' and 'FOAM'. ESPRESSO is a type of coffee made by forcing hot water through finely ground coffee beans. FOAM is a light, airy substance created by whipping air into a liquid. Together, ESPRESSO FOAM is a type of FOAM made from ESPRESSO that is used to top off ESPRESSO-based drinks. The crossword solution for this term is 'crema', which is a type of FOAM that forms on the surface of an ESPRESSO shot. Crema is a creamy, golden-brown FOAM that adds flavor and texture to ESPRESSO-based drinks.