The crossword solution for the term 'Tiramisu Ingredient' is 'ESPRESSO', which is an Italian coffee beverage made by forcing hot water through finely ground coffee beans. It is usually served in small cups and is known for its strong flavor and intense aroma. ESPRESSO is a key ingredient in the classic Italian dessert tiramisu, which is a layered cake made with ladyfingers, mascarpone cheese, and ESPRESSO-soaked sponge cake.