Combine brown sugar/honey, dijon mustard, lemon juice, soy sauce and garlic in a bowl. Stir until sugar dissolves.
Place pork chops in large resealable plastic container or bag. Pour marinade over pork chops; seal bag/container. Refrigerate for at least 4 hours (we typically marinade overnight), shaking container or turning bag occasionally.
Grill pork chops until instant-read thermometer inserted into center of chops registers 145°F to 150°F, about 5-7 minutes per side, brushing with leftover marinade and moving chops to cooler part of rack if burning.
Transfer chops to platter; cover with foil, and let stand 5 minutes. Serve.