Prepare ingredients: slice onion, mince garlic (if using fresh cloves), grate orange peel (if using), remove membrane from the back of the ribs, and generously coat both sides of the ribs with dry rub. Depending on the size of your slow cooker, you may need to cut each rack of ribs in half lengthwise.
Mix sauce: Add 4 oz of BBQ sauce, 2 tbsp of brown sugar, garlic, worcestershire sauce, and 4 oz of Natty Boh Crab Shack Shandy to the slow cooker. Mix until all ingredients are combined.
Start cookin': Line the bottom of the slow cooker with sliced onions and lay both racks of ribs on top. Coat the ribs with more BBQ sauce (about 4 oz) using a silicone brush. Cook on low for 8 hours or high for 4 hours if you're in a rush.
Finishing touches: In a small bowl, mix remaining BBQ sauce with 2 tbsp of brown sugar. Carefully remove ribs from slow cooker, lay each rack on a foiled baking sheet. Use a silicone brush to paint a thick layer of the BBQ sauce mixture over each rack and broil for 3-5 minutes or until the sauce starts to bubble and caramelize - keep a close eye on them! Alternatively, you can throw the racks straight on the grill (no foil), cover with BBQ sauce, close the lid, and cook for 3-5 minutes over high heat (about 500 degrees). A warm weather option!
To Serve: Divide ribs between two plates and garnish with grated orange peel if desired. I always serve ribs with a side like Roasted Potatoes.