For the ribs: Mix together the soy sauce, Worcestershire, liquid smoke, brown sugar, ginger, pinch of salt and 1 1/2 teaspoons pepper in a large measuring cup. Arrange the ribs in a roasting pan, hotel pan or baking dish large enough to fit them all. Pour the marinade over the ribs. Toss and flip until all the ribs are coated. Marinate 1 hour at room temperature or refrigerate up to overnight.
Preheat the oven to 250 degrees F. Line 3 rimmed baking sheets with aluminum foil.
Place 2 racks of ribs on each baking sheet, meat-side up. Brush with any remaining marinade left behind in the roasting pan. Cover with more foil. Bake for 2 hours.
For the Carolina moppin' sauce: Meanwhile, put the mustard, brown sugar, vinegar, granulated sugar, garlic powder, onion powder, smoked paprika and tomato sauce in a large saucepan and whisk until completely combined. Season lightly with salt and pepper. Place over medium-high heat and bring to a boil. Reduce to medium-low and simmer until thickened, about 1 hour.
Uncover the ribs and drain off the fat, reserving for another use (see Cook's Note). Mop or brush the sauce on both sides, returning the ribs to meat-side up. Raise the oven to 300 degrees F and bake the ribs, uncovered, until the meat is tender and the sauce begins to caramelize, about 1 more hour.
Mop the ribs again on both sides. Raise the oven to 375 degrees F and bake the ribs, uncovered and adding more sauce as it absorbs, until the meat gets brown and caramelized, about 1 hour more. Cut the ribs into individual pieces. Use the remaining sauce for serving, or keep in the refrigerator for later use.
You can use the drained fat from the ribs to boost flavor in stock and sauces. Refrigerate for up to 4 days, or freeze for up to 1 month.
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