Farro Bowl With Pomegranate Vinaigrette

Name: Farro Bowl With Pomegranate Vinaigrette
Ingredients: 1 ½ cups farro; 6 tablespoons olive oil, divided; 1 large sweet potato, peeled and cut into ¾-in. chunks; 1 teaspoon kosher salt, divided; 1 large shallot, finely chopped (about ¼ cup); 1 cup pomegranate juice; 1 tablespoon red wine vinegar; 2 teaspoons Dijon mustard; ¼ teaspoon freshly ground black pepper; 2 cups baby spinach; 1 medium fennel bulb, halved and thinly sliced, plus chopped fronds for serving; ½ cup crumbled feta cheese (about 2 oz.)