Combine the onion powder, paprika powder and cumin, and rub the ribs with dry rub.

Mince the garlic and add the dark soy sauce, sweet soy sauce and honey. Mix until well combined. Brush over the ribs. Save some of the marinade.

Cut the ribs in half and place them in the slow cooker. Cook for 7-8 hours on low or 4-5 hours on high.

Brush the rack of ribs every hour with the remaining marinade.