Remove outer layer of onion and chop in quarters.
Remove papery skin from garlic cloves.
Cut jalapeños in half (lengthwise)
Cut lime in half and squeeze juice.
Remove husks from tomatillos. Rinse under water and chop in quarters.
Apply non-stick spray to a baking pan. Place tomatillos, onion, garlic and jalapeños in the baking pan. Sprinkle with salt and pepper and broil for about 10 minutes.
Once tomatillos are lightly blackened, remove from oven and place in a blender.
Add cilantro, avocado and lime juice. Blend until soft and creamy.
Season to taste with salt and pepper.
Serve with chicken, pork, tortilla chips or any of your favorite Mexican dishes.