Remove the membrane from your ribs and cut each rack in half (so they fit in your slow cooker).
Combine the cayenne, ginger, paprika, and salt together in a small bowl and rub the mixture all over your ribs. Pop the ribs in your slow cooker.
Combine the remaining ingredients in a small bowl and mix until the brown sugar has dissolved. Pour the sauce over the ribs in the slow cooker and cook on high for 4 hours or on low for 8 – 10 hours.
Once the ribs are done, preheat your broiler for 10 minutes. While the broiler is preheating, strain the liquid from your slow cooker into a large frying pan (discard the fat). Boil the sauce for about 10 minutes to thicken it up, then brush it over the ribs.
Stick the ribs on a baking sheet lined with foil and broil until the ribs begin to sizzle. Serve warm.
Notes
Recommended low FODMAP serving – 1/3 rack of ribs per sitting