In a small saucepan, soften the onion, garlic, and jalapeño in the oil. Add the tomato paste and cook for about 1 minute. Add the evaporated milk and bring to a boil, stirring with a whisk. Simmer gently for about 2 minutes. Add the cheese and stir until melted. Season with salt and pepper. Set aside.
Cheeseburger
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