Put layer of sliced Sweet Onions on bottom of Crock pot.
Remove Ribs from skillet, place on top of onions in Crock pot.
Deglaze skillet with 1/2 cup Beef Broth.
Pour liquid in Crock pot.
Mix the remaining 1/2 cup of Beef Broth, Rum, can Diced Tomatoes, Diced Red Pepper, Ginger, Garlic, Brown Sugar, Thyme, Cinnamon, Nutmeg, Red Pepper Flakes, Orange Zest, in a bowl, pour over Short Ribs in Crock pot. Cook 6-8 hours on low setting until meat is falling off bone.