Preheat oven to 425.
Place 9 jalapenos, 3 garlic cloves, and ½ white onion on a baking dish. Roast for 15-20 minutes or until vegetables are soft and tender.
Remove tops of jalapenos. Discard tops.
In a food processor or blender, add roasted jalpapenos, onion, garlic, juice from 2 limes, large bunch of cilantro, 2 tbs olive oil, and 1 tsp salt.
Pulse on high until completely smooth.
Cool in refrigerator. Serve when cooled.
