In a small mixing bowl, whisk together honey, balsamic vinegar, Hoisin sauce, vegetable broth, brown sugar, Kosher salt, black pepper and garlic powder.
Rinse pork butter with cold water and place into slow cooker.
Cover with prepared sauce and top with sliced onions.
Set for 7 hours on low or 4 hours on high. Keep pot on high while pulling pork to cook and thicken sauce. Instructions are below.
Remove pork, shredded with two forks and discarding bone.
Remove a small amount of remaining liquid from the pot and whisk with cornstarch. Whisk to the larger batch.
Return pulled pork to the pot, tossing well with thickening sauce.
Turn pot to "keep warm" or off.
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