More Italians use Bialetti for their stovetop Italian coffee. With sturdy aluminum construction, the Moka Express is a product that actually improves with constant use. The unit is extremely simple to use. Just fill the lower chamber with water and the filter with ground espresso coffee. Place the pot on the stove and heat until the water boils. As it does, the liquid espresso moves to the upper chamber of the pot, ready to be poured into an awaiting espresso cup.