01 -
Combine water, kosher salt, brown sugar, curing salt, black peppercorns, coriander seeds, mustard seeds, smashed garlic, bay leaves, cinnamon stick, and crushed red pepper flakes in a large nonreactive container. Stir until salts and sugars dissolve completely and aromatics are evenly incorporated.
02 -
Submerge the brisket flat fully in the prepared brine, using a plate to weigh it down if necessary. Cover tightly and refrigerate for 5 to 7 days, turning the brisket every 1 to 2 days to ensure uniform curing.
03 -
Remove brisket from brine, discard brine, rinse thoroughly under cold water to remove excess salt and spices. Submerge in fresh water and soak for 1 hour, changing the water halfway through to further reduce saltiness. Pat dry completely with paper towels.
04 -
Toast black peppercorns, coriander seeds, and mustard seeds in a dry skillet over medium heat until fragrant, 2 to 3 minutes. Cool spices, then coarsely grind and mix with smoked paprika, garlic powder, cayenne pepper, and brown sugar.
05 -
Evenly press the spice rub all over the dried brisket. Place uncovered in the refrigerator and rest for at least 12 hours to develop flavor.
06 -
Preheat smoker to 225°F (107°C) using oak, cherry, or hickory wood. Smoke the brisket fat-side up until the internal temperature reaches 190°F (88°C), approximately 6 to 8 hours depending on thickness. Wrap in foil or butcher paper and rest for at least 1 hour before slicing.
07 -
Slice the pastrami thinly against the grain using a sharp knife or slicer. Lightly toast rye bread if desired. Pile pastrami evenly onto 4 slices of bread, spread with spicy brown mustard, and top with remaining bread slices. Serve with dill pickles.