Saw this recipe from Kikkoman for a soy-based turkey brine. Might give this one a try, as soy provides great umami flavor.
Savory Turkey Brine
For up to a 24 lb turkey
2 gal cold water
1/2 cup sugar
2 Tablespoons celery seed
10 oz soy sauce
1/2 cup kosher salt
2 Tablespoons dried sage
1 Tablespoon dried thyme
Combine ingredients in a large non-reactive container, stirring until salt is dissolved. Submerge turkey in brine. Refrigerate overnight or at least 8 hours. Remove from brine, rinse well, pat dry with paper towels, and cook the turkey as usual.
Savory Turkey Brine
For up to a 24 lb turkey
2 gal cold water
1/2 cup sugar
2 Tablespoons celery seed
10 oz soy sauce
1/2 cup kosher salt
2 Tablespoons dried sage
1 Tablespoon dried thyme
Combine ingredients in a large non-reactive container, stirring until salt is dissolved. Submerge turkey in brine. Refrigerate overnight or at least 8 hours. Remove from brine, rinse well, pat dry with paper towels, and cook the turkey as usual.