A hot and smoky chipotle chilli sauce, perfect for fajitas ... 1 tablespoon oil and a pinch of salt and pepper in a food processor. Blend for about 5 minutes, or until you have a paste.
Once all the milk is added, keep stirring, and bring the sauce to a gentle boil. Reduce the heat and simmer gently for 5 minutes. Season with salt and pepper. Stir in the cheese and allow to melt.