Place pre-soaked beans in slow cooker.
Add diced pork, molasses, mustard and 1 Tablespoon brown sugar. Mix well.
Cover beans with hot water to 1/2" above beans. (about 5-6 cups)
Cover and cook on high until boiling, then reduce heat and cook on low until beans are tender, about 8 hours.
Remove lid, turn slow cooker to high, and continue cooking with lid off, or cook on stove top until thick. Adjust flavor with additional brown sugar, salt and pepper if necessary.