Mtabga is a Tunisian stuffed flatbread, generous and spicy, prepared with a semolina-based dough and a stuffing flavored with tomato, onion, garlic, harissa, chili pepper and tabel-karouia. Associated with southern Tunisia and often the Gafsa region, it is one of those simple, nourishing street-food recipes that are deeply rooted in popular cuisine. Halfway between a…