Combine brine ingredients in a large bowl and stir until salt and sugar dissolve. Submerge the turkey, cover the bowl and refrigerate 24 hours. When ready to cook, remove turkey from brine, discard the brine and pat the turkey dry with paper towels.
3 quarts cold water, ½ cup kosher salt, ⅓ cup granulated sugar, 10 whole peppercorns, 1 boneless, skinless turkey breast