Preheat oven to 120⁰F.
Pulse garlic, salt and pepper in a food processor.
Remove and spread onto a cooking sheet.
Heat in oven for 3-4 hours or until the mixture starts to dry out. For even drying, rotate mixture every 15 minutes.
Once mixture dries, rub onto thighs.
Cover and refrigerate overnight.
In a charcoal grill, heat the charcoal until ash in color.
Place thighs on the grill.
Turn thighs using tongs; cover and grill for 25-30 minutes or until internal temperature reaches 180⁰F.