Spiced Sweet Potato Tacos

Ingredients

• 1 very large sweet potato (about 1 pound)
• ½ small red onion, cut into ¼-inch dice (about 1/2 cup)
• 2 small garlic cloves, minced (about 1 teaspoon)
• 1 (15-ounce) can pinto or black beans, rinsed and drained (about 1½ cups)
• ½ cup frozen sweet corn kernels, rinsed
• ½ teaspoon ground cumin
• ½ teaspoon ground ancho chile, or to taste
• Sea salt
• 12 to 16 corn tortillas
• 1 ripe Hass avocado, pitted and peeled
• 2 Roma (plum) tomatoes, cored and cut into ¼-inch dice (about 1 cup)
• 3 scallions, white and green parts, thinly sliced (about 3/4 cup)
• ¼ cup finely chopped fresh cilantro
• 2 tablespoons fresh lime juice (from 1 lime)