Arrange tomatillos, tomatoes, onion and chili pepper on an unoiled baking sheet
Broil on high 6 inches from heat for 12-15 minutes, checking every 5 minutes and turning as needed
When veggies have a little char in spots and tomatillos are soft remove from oven and cool slightly
Place cooked veggies and remaining ingredients in blender or bowl of food processor, or use immersion blender, and pulse off and on until to the texture you prefer. Taste and adjust seasonings as needed.