Place the diced onion, pepper and garlic in a pot
Pour in the beer and bring to a simmer. Simmer for 2 minutes
Toss the shredded cheese with the corn starch
Place the shredded cheeses into the crock pot
Pour the hot beer and vegetables over the cheeses
Add the XXX El Yucateco Hot Sauce and lemon juice
Stir and cover. Cook on high for one hour stirring every half hour or so
OR to cook on the stove top
Add the hot sauce, lemon juice, shredded cheeses and cornstarch to the hot beer and vegetables
Stir and simmer on medium low heat until smooth, about 5 minutes
Serve with grilled meats, vegetables and bread