Queso Fundido con Chorizo

fresh chorizo, casings removed, crumbled

Olive oil, as needed

small red onion, chopped

garlic, finely chopped

all-purpose flour

Mexican lager-style beer, such as Negra Modelo

chopped pickled jalapeno, plus 1 tablespoon pickling juice

milk

Monterey Jack cheese, finely diced (about 1 cup)

whole-milk mozzarella, finely diced (about 1 cup)

chopped cilantro

Warmed tortilla wedges, tortilla chips, bell pepper triangles or French fries, for dipping