Natural chile con queso

unsalted butter

medium yellow onion, diced

Serrano chiles, seeded and diced

jalapeños, seeded and diced

garlic, minced

flour

milk

hand-shredded (never pre-shredded) cheese, can use any combination of Longhorn cheddar and Monterrey Jack ((see note))

chopped cilantro

plum tomatoes, peeled and diced (about 1 cup, can use canned if tomatoes aren’t in season)

sour cream

ground cumin

Salt