A Tunisian tajine, not to be confused with a stewy Moroccan tagine, is an egg dish similar to a frittata. This recipe is our version of tajine maadnous, which combines eggs with meat (often lamb, chicken or beef), a starchy element (either bread or potatoes) and cheese, along with a good amount of parsley. Cumin, turmeric and harissa, a fragrant chili paste common in Maghrebi cooking, lend bold flavor to this super-simple one-pan meal. Look for harissa in well-stocked grocery stores, spice shops or Middle Eastern markets. We start the cooking on the stovetop and finish the omelet in the oven, so you will need an oven-safe 12-inch nonstick skillet.