pangalawang tiyan ng ibon o manok

chicken gizzard, craw

Also spelled as balumbalunan and balun-balunan.

The Tagalog word balunbalunan refers to the gizzard of birds. The gizzard is a muscular pouch behind the stomach in the alimentary canal. It has a thick lining and often contains ingested grit that aids in the breakdown of seeds before digestion. It is found in the lower stomach of fowl.

The portion of the gizzard that grinds ingested food is usually removed before the gizzard reaches market. Because it is very tough, poultry gizzard needs a lot of cooking.

In the Philippines, a common way of preparing balunbalunan is to cook it adobo style, meaning with soy sauce, vinegar and a bay leaf. It is usually paired with atay (liver). It can also be fried or sautéed.

Other English names for balunbalunan: ventriculus, gastric mill, gigerium

Andoy Balunbalunan is the name of a pre-war Filipino actor and comedian. His wife was the famous Filipina comedienne Dely Atay-Atayan who died in 2004. He is the grandfather of 70s actress Ann Villegas.