Beans and Greens Tacos

Name: Beans and Greens Tacos
Ingredients: 2 Tbs. olive oil; 1 red onion, halved and cut into 1/4-inch (6-mm) slices; Kosher salt and freshly ground pepper; 2 garlic cloves, minced; 10 oz. (315 g) baby kale or stemmed and chopped regular kale; 1 can (15 oz./470 g) pinto beans, rinsed and drained; 1/3 cup (3 fl. oz./80 ml) low-sodium vegetable broth; Juice of 1 lime; 8 multigrain, corn or flour tortillas, warmed; 3/4 cup (4 oz./125 g) crumbled cotija cheese; 1/4 cup (1/3 oz./10 g) loosely packed fresh cilantro leaves; 3/4 cup (6 oz./185 g) Mexican crema or sour cream (optional)