How to Roast Hatch Chiles: 1. Get grill as hot as you can (around 450degF). 2. Add chiles to the grate in a single layer and close the grill.3. After 10 minutes, flip each chile over. 4. After another 10 minutes, remove from grill to a large bowl or pot. Cover tightly with plastic wrap and let sit for 30-45 minutes.
Remove the stems and seeds from the chiles. Then peel the outer skin off.
Place peeled chiles on a cutting board and chop to desired consistency.
Add onions, lime juice and salt. Chop some more to integrate. Then transfer to a bowl.
Serve right away or cover and place in refrigerator for up to 4 days.