Beef Tenderloin and Pickled Onion Tacos Recipe

Name: Beef Tenderloin and Pickled Onion Tacos Recipe
Ingredients: 2 small beef tenderloin steaks, about 4 ounces each; 1 teaspoon cumin; 1 teaspoon chili powder; Kosher salt; 1 red onion, sliced thinly; 1/4 cup wine vinegar; 1 tablespoon of vegetable, canola, or olive oil; 10 small (4 1/2 inches) corn tortillas, warmed according to these instructions; 1 cup diced or grated queso fresco or cotija; 1/2 cup roughly chopped fresh cilantro leaves and fine stems; 1 lime, cut in small wedges