
Add 1 tablespoon olive oil to a medium saucepan and heat over medium high heat. Add the ½ cup onion, 3 garlic cloves, poblano, and jalapeño and sauté until lightly browned.
Add the tomatillos and the stock.
Cover and simmer until soft. About 10 minutes. Then remove from heat and let it cool slightly.
Add the tomatillo mix (without the liquid), cilantro, salt & pepper to a blender or food processor. Blend until there are no big chunks and reaches your desired consistency.