Braised Greens with Aleppo Oil and Feta

Name: Braised Greens with Aleppo Oil and Feta
Ingredients: ½ cup olive oil, divided; 1 large fennel bulb, cored, thinly sliced; 1 large onion, thinly sliced; Kosher salt; 8 garlic cloves, thinly sliced; 2 bunches Tuscan kale, tough stems removed, leaves torn into pieces; 1 bunch broccoli rabe, tough stems removed, large clusters separated into smaller pieces; 1 teaspoon crushed red pepper flakes; 1 tablespoon Aleppo pepper; ½ teaspoon paprika; 1 tablespoon finely grated lemon zest; 1 tablespoon fresh lemon juice; 6 ounces feta cheese, broken into large pieces