Preheat oven to 350˚F. Butter a rimmed baking sheet.

Place a large skillet over medium/high heat with 1 tablespoon olive oil and 2 tablespoon butter. Add sliced onion and sauté over medium heat for 5 minutes until softened, stirring occasionally. Sprinkle with ¼ teaspoon sugar and sauté uncovered 5 minutes until caramelized and golden, stirring often. Transfer to a plate.

In the same pan, add 2 ½ cups water and scrape the pan to deglaze. Add the au jus seasoning (adding to taste) then bring to a boil, reduce heat and simmer according to package instructions. Add more water to taste if it’s too salty.

Cut buns in half. Place the bottom half of dinner rolls on a buttered baking sheet and spread ¼ cup mayo. Layer folded slices of beef evenly over the rolls. Spread caramelized onions over your sliders. Cover the beef with sliced provolone.

Place the top of buns over and brush the tops with 2 tablespoon melted butter then immediately sprinkle tops with sesame seeds. Bake uncovered at 350˚F for 12-15 minutes, or until cheese is melted and tops are golden brown.