The name comes from Hausa tuwon zafi, 'hot tuwo': it refers to the dish being eaten piping hot, straight from the pot, not to chili heat.
A smooth dough of maize or millet flour is stirred over heat until light and elastic, then served with a dark green, slightly slippery soup made from dried ayoyo (jute mallow) leaves and a spiced pepper base.
Why it's made this way: Tuo zaafi is to Ghana's Northern, Upper East, and Upper West regions what fufu is to the south — a daily staple built on the grains that grow best in the drier savanna climate.