"This is traditional Peruvian spicy cheese sauce, often served over boiled and sliced potatoes. The recipe was created based on my experiences living in Peru and makes for a delicious and easy dinner starter. Serve at room temperature or cold over boiled potatoes and top with sliced boiled eggs and kalamata olives; dust with paprika (or rocoto if you have some)."
Heat oil in a skillet over medium heat; saute onion, aji peppers, and garlic until onion softens and mixture is bright yellow, 5 to 10 minutes. Transfer mixture to a blender; add milk and blend until smooth. Add queso fresco and crackers to mixture and blend until sauce is smooth and the consistency of thick yogurt. Season with salt and pepper.