Crostini are simply thick slices of toasted bread, usually topped with something savory. In Tuscany, crostini are frequently spread with a chicken liver mixture and served with drinks before dinner. Whole wheat Italian bread makes especially delicious crostini. The bread can be toasted on a grill, under a broiler, or in a toaster oven as well as in the oven. Crostini are usually served with the topping already spread on the toasts, but don’t assemble them more than half an hour in advance.