INGREDIENTS 1/2 small red onion, sliced Juice of 1 lime 2 tbsp. butter 2 tbsp. vegetable oil, plus more for frying 1/2 small yellow onion, minced 1/2 tsp. dried oregano 1/2 tsp. chili powder Kosher salt Freshly ground black pepper 2 (15.5-oz.) cans pinto beans, drained and rinsed 6 corn tortillas FOR TOPPING 1 1/2 […]