In a bowl combine brown sugar, hot chili powder, paprika, cumin, kosher salt, and black pepper to make the spice mix.
Sauce:
Preheat half the barbeque to medium-high or 375 F (190 C).
Cut the top off the garlic bulb, rub with olive oil, place in a tinfoil basket and top with thyme, and salt to season, close the top of the tinfoil and roast for 30 minutes on the unlit side barbeque.
Once cooled remove the cloves.
Heat olive oil in a saucepan. Add onion and sauté until soft.
Add 1/2 bulb of mashed roasted garlic, tomato, balsamic vinegar, maple syrup, salt, and pepper.
Stir, cooking, a few minutes. Remove from heat, let cool.
Pork chops:
Preheat the barbeque to medium-high or 375 F. (190 C).
Rest the pork chops to room temperature.
Season pork chops with the spice mix.
On the barbeque spray grill surface place pork chops to grill for five minutes.
Then turn the chops to create a crosshatch and cook for another three minutes.
Flip the chops and repeat the process from the first side or to an internal temperature of 145 F (63 C).
Plate and serve with the roasted garlic tomato sauce and top with chives
Note: Cooking times and temperatures will vary depending on the size and type of your barbeque.