Puto is a kind of steamed rice cake in Philippine cuisine. It is eaten as is or with butter and/or grated fresh coconut or as accompaniment to a number of savory dishes for breakfast (most notably, with dinuguan).
The most common shape used for making puto is round, the exact size of the steamer which is actually named after puto itself in Filipino, putuhan, and can range from 30 cm to 60 cm in diameter and between 2 cm to 5 cm in thickness. These puto steamers are actually rings made of either soldered sheet metal built around a perforated pan or thin strips of bent bamboo enclosing a flat basket slats of split bamboo sticks. The cover is almost always conical to trap the condensing steam and allow it to drip along the perimeter instead of on the steaming cake. To steam puto, a muslin cloth (katsa) is stretched out right on the steamer ring and the prepared rice batter poured directly on it. The alternative method uses banana leaf to line the steamer. These large thick cakes are then sold or served sliced into diamond or lozenge shaped individual portions.
The Filipino dish Dinuguan is traditionally served with Puto.
Sources: Bogart the Explorer from Davao City and Wikipedia.com