Tuna tacos with onions are a delicious and healthy twist on traditional tacos. The tuna is seasoned with a flavorful blend of spices and cooked until tender. The onions add a sweet and savory element to the dish, while also providing a nice crunch. These tacos are perfect for a quick and easy weeknight dinner, and can be customized with your favorite toppings and sauces. Serve them with a side of guacamole and salsa for a complete meal.