Cowboy Hot Tamale Pie

• 350 about
• 1 onion
• 1,000 gr baking dish with of cornmeal mush
• 700 gr beef (lean ground)
• 600 ml water (cold)
• 300 gr tomatoes
• 230 gr kernel corn (cooked whole)
• 120 gr cornmeal (yellow)
• 110 gr cheddar cheese (shredded)
• 50 gr pitted black olives (drained)