grams fine sea salt (2 tablespoons)
half turkey breast (about 2 1/2 pounds), on or off the bone
- One to two days before you plan to cook, place buttermilk and salt in a gallon-size resealable plastic bag and stir to dissolve salt. Place turkey breast in the bag and seal carefully, expelling the air. Squish the bag to distribute buttermilk all around the turkey, place on a rimmed plate, and refrigerate for 24 to 36 hours. If you’re so inclined, you can turn the bag periodically so every part of the turkey gets marinated, but that’s not essential.
- Two hours before you plan to start cooking, remove the turkey from the plastic bag and scrape off as much buttermilk as you can without being obsessive. Discard buttermilk, set the breast on a rimmed plate and bring it to room temperature.
- Position a rack in the upper third of the oven and heat to 425 degrees. Place breast skin-side up on a rimmed baking sheet lined with a wire rack or parchment paper. Roast on prepared rack until an instant-read thermometer inserted into the deepest part of the breast without touching bone registers 150 degrees, about 40 minutes for a boneless breast or 50 minutes for a bone-in breast. (You may want to tent the breast with aluminum foil if it’s darkening too quickly.)
- Transfer to a cutting board or platter and allow to rest at least 15 minutes before carving.