Brown the meat and onion in a large nonstick skillet over medium-high heat for 5 minutes, breaking up the meat into crumbles as it cooks. Pour the drippings out of the pan and discard. Add the garlic, jalapeno, and red pepper and cook 5 minutes more, stirring occasionally. Stir in the rest of the ingredients, except the buns, reduce the heat to low, and simmer for another 5 minutes.

Place a 12-cup scoop of the mixture onto each bun and serve.