Snip the stems of the chiles and shake out the seeds.
Toast the chiles for 1-2 minutes in a dry pan.
Mark an X on the top of the tomatoes with a knife.
Place the tomatoes on a foil-lined baking sheet with the garlic cloves.
Broil on high for 5 minutes.
Remove the garlic and flip the tomatoes. Broil for 5 more minutes.
Place the chiles in a saucepan with 2 cups of water. Cover and cook for 20 minutes.
Peel the tomatoes and garlic and place in a blender.
Add the vinegar, oregano, salt. reserved water, jalapeno, tomatoes, onion, lime and cumin in the blender.
Process until smooth.
Pour in a saucepan and bring to a boil.
Serve hot or cold with your favorite dipper.