In a large pot, combine water, salt, sugar, and spices. Bring to a simmer, stirring until the salt and sugar dissolve. Remove from heat, add citrus slices, and let the brine cool completely.
Brine the turkey
Place the turkey in a large food-safe bag or pot. Pour in the cooled brine, making sure the bird is fully submerged. Refrigerate for 12–18 hours. If the turkey won’t fit in your fridge, use a cooler filled with ice to keep it cold.
Rinse and dry
Remove the turkey from the brine and rinse it well with cold water. Pat dry with paper towels. This step is key—dry skin helps it roast beautifully crisp.
Season and roast
Rub the turkey all over with olive oil or butter. Roast at 325°F (163°C) following standard cooking times (about 15 minutes per pound), until the internal temperature reaches 165°F (74°C) in the thickest part of the breast.
Rest before carving
Once out of the oven, cover the turkey loosely with foil and let it rest for 20–30 minutes. This allows the juices to redistribute, keeping every bite moist.