
Make the barbecue sauce by combining ketchup, molasses, Worcestershire, brown sugar, apple cider vinegar, onion powder, garlic powder, cumin, chili powder, ground coriander, and 1 teaspoon salt in a small saucepan. Bring the mixture to a boil over high heat before reducing the heat to medium-low. Simmer the sauce for 15 minutes, until the flavors meld together. Let the mixture cool before storing it in an airtight container in the refrigerator. If you don't want to make your own barbecue sauce, use one cup of store-bought sweet-and-tangy barbecue sauce.
Meanwhile, chop the pork chops into 1-inch cubes. Place the pork cubes in the food processor with the water, white sugar, and the rest of the salt. Process the mixture until it's smooth, like ground pork.
Divide the ground pork into four 4-ounce portions. Form each portion into a rectangle that's roughly 6-1/2 by 3-inches. Using your fingers, create indentations to make the patties look like "ribs."
Place the patties on a piece of parchment paper. Cover the patties with another piece of parchment. Freeze the patties until they're frozen solid, about 2 hours.
Remove the patties from the freezer. Preheat a griddle or cast-iron skillet over high heat. When the griddle is hot, add the pork and cook for 3 to 4 minutes a side, until browned on each side and cooked through. Let the pork cool for a minute or two.
While the pork is cooling, spread 1/2 tablespoon of the butter onto the cut side of each bun. Place the buns on the hot griddle, cut-side down, until they're lightly browned, about 1 minute.
Meanwhile, place one cup of the prepared barbecue sauce in a large bowl. Dip the pork patties into the barbecue sauce, letting any excess drip off.
Place the pork patties onto the prepared buns. Top the pork with a few pickle slices and 2 tablespoons of the sliced onions.