For the Lamb Chops: Combine olive oil, rosemary, garlic powder, lemon zest, salt, and pepper. Rub onto lamb chops.
For the Blueberry Black Garlic Glaze: Combine blueberries, black garlic paste, balsamic vinegar, brown sugar, Dijon mustard, and soy sauce in a saucepan. Cook over medium heat, stirring occasionally, until blueberries have burst and the sauce has thickened, about 5-7 minutes. Stir in butter and red pepper flakes (if using).
Grill lamb chops to desired doneness.
Brush glaze over lamb chops during the last few minutes of grilling.
