Spicy South African Sausage Roll

AS THE SON OF A SOUTH AFRICAN IMMIGRANT, I AM WELL ACQUAINTED WITH THIS particular dog. Boerewors (pronounced BUR-ra-vorz; Afrikaans for “farmer’s sausage”) is a fatty, spicy beef-and-pork concoction served in a lightly grilled bun with a mound of sautéed onions, and a chunky, spicy, ketchup-like tomato sauce on the side. It’s a typical example of the richly flavored fare of South Africa, whose culinary traditions have roots in Dutch, English, Indian, and Asian cuisines