Put 1 quart of the water into a saucepan along with the brown sugar, salt, coriander, mustard seed, peppercorns, fennel, cinnamon, chile flakes, cloves, and bay leaves.
2 Bring just to a simmer, stirring until the salt and sugar dissolve.
3 Remove from the heat and add the remaining 1 quart cold water. Chill the brine completely.
4 Put the turkey into a nonreactive container or large zip-top bag and pour the cold brine over it. Refrigerate 18-24 hours. USDA recommends keeping poultry refrigerated during brining.
Day of:
5 Take the turkey out of the brine and discard the brine.
6 Don't rinse the turkey. Just pat it extremely dry with paper towels.
7 Mix all the rub ingredients and press the mixture generously over every surface of the breast.
8 I don't think you need mustard or oil as a binder here. A slightly damp turkey surface should hold that coarse pepper-and-coriander mixture just fine.
9 Into the smoker immediately
10 Preheat to: 275°F
11 I like a fairly restrained smoke for turkey. Apple, cherry, pecan, or a mild hickory would all work. I wouldn't bury this under mesquite.
12 Put the breast and any tenderloins into the smoker.
13 The original recipe smokes at 250°F and says it can take up to two hours. Moving to 275°F gives us some schedule insurance while still providing plenty of smoking time.
Cooking:
14 Start checking the tenderloins after about 45 minutes. They're our secret weapon for the stream because they're likely to finish considerably before the breast.
15 Check the breast beginning around 1 hour.
16 Cook until the thickest part reaches 165°F. USDA's safe minimum temperature for poultry is 165°F.
17 Remove and loosely tent with foil.
18 Rest: 15-20 minutes
19 For immediate tasting, slice thinly across the grain.
20 Chill it before serious slicing
21 Once cooled, refrigerate the breast until thoroughly cold — preferably overnight.
22 A cold turkey breast will slice much thinner and cleaner than a warm one. If you've got a deli slicer, this is where it earns its keep.
23 I would portion it into roughly 4-6 oz packages for refrigerator/freezer use.