Get out and measure your ingredients.
Preheat a cast iron skillet over medium high heat for 5 minutes.
Slice tomatillos, onion, banana pepper, shallot, and garlic cloves in half. Seed the serrano peppers and slice in half.
Add olive oil to the skillet and swirl to coat. Add tomatillos, onion, peppers, shallot, and garlic clove cut side down to the skillet.
Cook for 20 minutes, flip the veggies every 4-5 minutes.
Remove cast iron from heat and let cool for 5 minutes. Then, transfer ingredients to a food processor or blender.
Add parsley, cilantro, lime juice, salt, cumin, black pepper, coriander, and oregano.
Puree for 15-20 seconds.
Pour salsa into mason jars and allow to cool completely before storing.
Enjoy every bite!