Tuo Zaafi — universally known as "TZ" — is the signature staple of northern Ghana, where it is eaten daily by millions of people across the Dagomba, Mamprusi, Gonja, and other northern ethnic groups. Made from millet (or sometimes corn or cassava), TZ is cooked into a smooth, very thick, smooth porridge-like dough that is eaten with soups.

TZ is the northern equivalent of fufu or banku — a neutral, filling carbohydrate base whose purpose is to carry the accompanying soup. In the north, it is most commonly eaten with ayoyo soup (made from jute leaves), groundnut soup, or sobolo-based stews. The combination of TZ with ayoyo soup — a slightly mucilaginous, green leaf soup — is considered the quintessential northern Ghanaian meal.

TZ has become increasingly popular across Ghana in recent decades, with chop bars (informal restaurants) across Accra now serving it alongside more familiar southern staples. It represents the proud culinary identity of Ghana's north and is a point of cultural connection between Ghana's diverse ethnic communities.