Start preparing the goose breasts the night before. Place the goose in a large Ziploc bag and cover with salt water. Soak for 6-8 hours then drain. Rinse then cover the goose with plain water overnight. Drain and cover with buttermilk. Soak for at least 3 hours.
Slice the goose breasts.
Combine all the ingredients together in a bowl to make the sauce.
Layer ingredients in the slow cooker starting with a thin layer of sauce. Alternate half the goose and half the sauce, ending with the sauce.
Cook on low for 8-9 hours.
Serve over brown jasmine rice (or plain rice if you can’t find jasmine rice).