Brown the meat in a large pan. Drain, put back into the pan and add leeks. Cook till vegetables are translucent. Add diced peppers, stir and cook for 2 minutes. Set aside.
In a very large pan, mix tomatoes, seasoned tomatoes and tomato sauce. Add vegetables and meat. Spice the chili with cumin, paprika, crushed pepper, coriander and tabasco.
Heat at medium heat for about 20 minutes and add beans and corn kernels. Heat for another tens of minutes.
Put a first can of tomato paste and verify the texture. Add a second can, up to taste. Rectify seasonings.
In an oven safe plate, add nachos, pour chili and cover with tex-mex cheese. Broil under the grill to gratin.