Fonsecas Quesabirria Melt: Named for the Beloved Fonseca Family. Fonsecas Quesabirria Crimson Melt features slow-roasted beef, Monterey Jack cheese, fresh cilantro, and onion, all nestled between slices of fresh sourdough bread. It’s served with a rich, house-made consommé for dipping, offering a savory and satisfying fusion of flavors.