Salsa Huancaína: Peruvian Spicy Cheese Sauce

Name: Salsa Huancaína: Peruvian Spicy Cheese Sauce
Prep time: 15 min
Cook time: 5 min
Total time: 20 min
Cuisine: Latin American
Ingredients: 3 to 4 yellow aji amarillo chile peppers (frozen is fine) or 1/2 cup jarred aji amarillo paste; 4 tablespoons vegetable oil; 1/2 cup chopped onion; 2 cloves garlic (mashed); 3/4 cup evaporated milk; 2 cups white queso fresco cheese (or farmer's cheese , or a mixture of mozzarella and feta cheese); 4 saltine crackers; Salt to taste; Pepper to taste