Grill yellow onion slices, covered over medium heat, 12 to 14 minutes, turning occasionally. Roughly chop grilled onion; set aside to cool.
Combine grilled onion, cilantro, chipotle peppers, garlic, black pepper and 1/2 teaspoon salt in blender container. Cover; pulse on and off until pureed. With blender running, slowly add oil to blender through opening in cover, processing until smooth. Reserve 1 cup salsa; cover and refrigerate.
Place beef steaks and remaining salsa in food-safe plastic bag; turn steak to coat. Close bag securely and marinate in refrigerator 30 minutes.
Ingredients
1 tsp black pepper, ground
1 cup Peak Fresh Produce® Cilantro, about 1/2 bunch
2 cloves Peak Fresh Produce® Garlic
1/2 cup Roma® Oil, Olive
1 can Contigo® Pepper(s), Chipotle in Adobo Sauce, 7 oz
1/2 tsp salt, kosher
2 slices Peak Fresh Produce® Onion(s), Yellow, 1/2 in think