Chtitha is a whole family of dishes — chtitha djej with chicken, chtitha lham with meat, chtitha batata with potatoes — all built on the same derssa-and-tomato red sauce.
Chtitha batata simmers potatoes in a red sauce built on derssa (a garlic and chili paste), tomatoes, and warming spices until the potatoes turn deep orange and soak up the heat. This meat-free version is a favorite everyday dish across Algeria.