Ingredients
- 1 pound broccoli rabe, trimmed and cut crosswise into thirds
- 6 tablespoons extra-virgin olive oil
- Four 1-inch-thick tuna steaks (about 5 ounces each)
- Salt and black pepper
- 2 onions, thinly sliced
- 2 tablespoons confectioners' sugar
- 2 tablespoons apple cider vinegar
- 4 cloves garlic, smashed and peeled
- 1/4 teaspoon crushed red pepper flakes
- 1 cup instant polenta
Description

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