Place porkloin, onion, green pepper, and rosemary into slow cooker and cook on high for 4-5 hours.
Meanwhile, bring vinegar, ketchup, brown sugar, honey, Worcestershire, dijon, garlic, and salt & pepper to a boil in a large skillet over medium-high heat.
Reduce heat to low and simmer sauce for 20-25 minutes.
Remove porkloin from slow cooker and shred.
Return to slow cooker with sauce and cook on low for 1 hour.
Serve on slider buns.
Recipe by Rachel Schultz at https://rachelschultz.com/2013/05/07/balsamic-honey-pulled-pork-sliders/