Sauté the onion, salt and oil or broth until the onions are soft and browning. About 5 minutes.
Add the tomatillos, peppers, garlic, cilantro and oregano and cook until the tomatillos have released their liquid and everything is beginning to brown. About 7-8 minutes.
Next, take the mixture and carefully put it in a blender, making sure not to get burned. Pulse to chop. Make it as smooth as you prefer.
Serve with chips and on everything!
Notes
Don't Over-blend: I like to pulse the salsa a few times for a chunkier dip, or blend it smooth only if I’m using it as a sauce. Start slow - you can always blend more, but you can’t un-blend it!
Adjust The Spice: Want it milder? Use more poblano, anaheim or guajillo peppers and skip the jalapeño. Want it hotter? Add a second jalapeño or toss in a serrano or habanero pepper.
Remove The Pith: The spiciest part of a pepper is the white pith (where the seeds attach). My recipe calls for deseeding to keep the heat manageable, especially since I serve this to my kids too. If you like FIRE hot, leave the pith for added spice.
Don’t Skip The Sauté: Cooking the veggies before blending brings out their sweetness and depth. Raw salsas are good, but this one is next level.
Let Cool Before Blending: I have blended this sauce right off the stovetop and trust me, it's not a good idea! My salsa exploded out of my blender because heat expands when it's blended. Let it cool slightly, then blend.
This makes about 2 1/2 cups, serving size is 1/4 cup.