Place a couple of tablespoons of olive oil in a large skillet.
Add onions, peppers and mushrooms and sauté until veggies are softened.
Place remaining olive oil in another large skillet.
Sauté beef with a lid, covered, until beef cooks through and is no longer tough.
(This may take 30 minutes or so, and you may have to keep adding additional water as the liquid evaporates.)
Once beef is fork tender, combine beef with veggies.
Slice sweet rolls in half.
Divide the 24 sweet rolls between two 9x13” greased glass baking dishes.
Place half of a provolone cheese slice on top of each roll. (I folded the halves in half).
Spread with beef/veggie between the two dishes.
Top with remaining provolone halves, then the top part of the Hawaiian sweet roll.
Melt butter and add remaining garlic.
Brush melted butter mixture over top of each roll.
Cover each dish with foil and bake at 350° for about 25 minutes, until cheese melts.
Remove foil and bake an additional 5 minutes to lightly brown the tops of the rolls.