The small squares are dried and then steamed over the simmering sauce, the way couscous is cooked, rather than boiled like Italian pasta.
Trida is a thin homemade pasta cut into small squares, steamed and served with chicken, chickpeas and hard-boiled egg in a white or tomato-based sauce, sometimes with meatballs.
Why it's made this way: Trida is closely tied to Constantine, where it's made for family celebrations and religious holidays, and it's also cooked in other eastern Algerian cities.