Mexican Lasagna

Ingredients:

1 lb ground beef

1 medium onion, diced

1 (14.5 ounce) can fire-roasted diced tomatoes, undrained

1 (15 ounce) can black beans, rinsed and drained

1 (10 ounce) can Rotel (diced tomatoes with green chilies), undrained

1 packet (1.25 ounces) taco seasoning

1/2 cup water

12 corn tortillas (6-inch)