Place the chopped bacon in a medium sauce pot over medium heat. Brown the bacon, then add the chopped beef roast, onions, and garlic, and cook another 5-8 minutes until the beef is browned on all sides. Stir occasionally.
Add the spices and sugar to the pot, along with the canned tomatoes and beans. Add 1/2 teaspoon salt and 1/2 teaspoon pepper. Stir and cover. Once the mixture comes to a boil, lower the heat and simmer for 1 1/2-2 hours, until the beef is very tender. (The smaller you chop the beef the faster this happens.) Once the meat is tender, add the masa and lime juice. Stir and allow the masa to thicken the chili for another 5 minutes. Salt and pepper to taste.
Once the chili is ready, Preheat the grill to high heat. Separate the ground beef and form into 6 patties that are just slightly larger than the buns. Sprinkle both sides generously with seasoning salt.
Grill the patties for 3-5 minutes per side. (I like mine a little pink, so three minutes per side is usually perfect.) Then grill the sliced onion rounds for 1-2 minutes per side.
Place the grilled onions of the bottom bun, followed by the hamburger patty, a heaping scoop of hot chili, a hefty sprinkle of cheddar cheese, and a handful of Fritos. Place the top bun over the stack and press a little.