
Preheat oven to 400 degrees. Salt and pepper the pork and sprinkle with 1 Tbsp of thyme. Set aside.
Pit and halve the plums. Add the plums, ketchup, Worcestershire sauce, molasses, apple cider vinegar, stevia/monkfruit sweetener, liquid smoke, mustard, shallots, and black pepper to a food processor and pulse until smooth. Add water to get to desired consistency.
Brush the pork with the bbq sauce covering the sides as well. Roast for 15 minutes and then brush the pork with another round of bbq sauce. Roast for another 10-15 minutes until the internal temp is at least 140 degrees (it will get to 145 degrees when it rests).
Brush the pork with BBQ sauce again and sprinkle with the last tbsp of thyme on top of the pork. Let rest for about 5-10 minutes before slicing. Serve with extra BBQ sauce as needed.