1 tablespoon corn oil
1/2 cup finely chopped sweet white onion
1/2 cup finely chopped bell pepper or jalapeno, or a combination
1 teaspoon ground cumin
1 teaspoon granulated garlic
1/2 teaspoon salt
2 tablespoons cornstarch
1 cup water or chicken broth
8 ounces shredded cheese
1 cup chopped fresh tomatoes
Using a thick, heavy spot, heat the oil and sauté the onion and the dry ingredients for 2 to 3 minutes, until the onion is translucent.
Add the water or broth, and heat 3 to 4 minutes, allowing the sauce to thicken, then add the shredded cheese and tomatoes.
Carefully simmer the queso on low heat for 3 to 5 minutes, adjusting its thickness to suit your taste by adding water or cheese. Serve hot with salted fried flour or corn tortillas.