Heat the oven to 325°F. Season beef with salt and pepper and brown in oil in a small Dutch oven for 3 minutes per side.
Add broth, water, onion, garlic and Worcestershire. Cover and braise for 3 to 3 1/2 hours until the beef shreds easily, checking once and adding a little of the measured broth from the pot over any exposed meat.
Shred the meat and drain it thoroughly, reserving the cooking liquid. Strain and skim the liquid and keep it hot for dipping. Increase the oven to 350°F.
Split the connected Hawaiian rolls horizontally and put the bottoms in a parchment-lined 9-by-13-inch pan. Layer on half the provolone, drained beef and remaining provolone, then replace the tops.
Mix butter with onion powder and brush over the rolls. Cover with foil and bake for 15 minutes, then uncover for 8 to 10 minutes until the center is 165°F.
Rest for 5 minutes, cut into 12 sliders and serve with the hot strained beef broth for dipping.