Brined Roast Turkey

1 (14 to 16 pound) frozen young turkey
For the brine:
1 cup kosher salt
1/2 cup light brown sugar
1 gallon vegetable stock
1 tablespoon black peppercorns
1/2 tablespoon allspice berries
1/2 tablespoon candied ginger
1 gallon iced water
For the aromatics:
1 red apple, sliced
1/2 onion, sliced
1 cinnamon stick
1 cup water
4 sprigs rosemary
6 leaves sage
Canola oil Combine all brine ingredients, except ice water, [...]