Mix sea salt, cumin, red pepper flakes, coriander, dry mustard, garlic powder and ground pepper in a small bowl. Mix spices well and set aside one generous tablespoon for the sauce.
Season a whole thawed out chicken with the spice rub and lemon zest. Season inside the cavity as well as under the skin.
Tuck the wings behind the back of the bird. Place chicken on a baking dish with a wire rack and keep in the refrigerator overnight to dry brine.
On the day of grilling, make the beer can sauce by combining ketchup, Dijon mustard, molasses, red wine vinegar and hot sauce in a small bowl.
Set up your grill for indirect grilling (either place hot coals on one side or on both sides of the grill with a foil tray in the middle).
Pour half of the beer out. Beer drinkers, feel free to enjoy this step!
Punch some holes on the top of the beer can with a church key style can opener.
Add the 1 tablespoon spice rub that you’ve set aside to the beer can sauce and pour this mixture into the can using a funnel.
Place the chicken on top of the beer can and position it so it’s stable. You can also use a metal pie plate as a base to help collect juices and handle the chicken more easily. Grill the chicken on indirect heat and cover. If roasting in an oven, set your oven to 350F. At about the 1 hour mark, check your chicken for even browning and turn if necessary. Baste with juices that have collected in the bottom.
Roast the chicken for an additional 30 minutes or until a thermometer reads 165F on the thickest part.
Take off the grill and let stand when done. Cool slightly before handling. When the chicken is cool enough to handle, take the bird off the can and pour the sauce into a small sauce pot. Reduce the sauce a little bit while you arrange the roast chicken on a serving plate or divide it into quarters using kitchen shears.
Serve your perfectly roasted chicken with the sauce on the side.