Heat butter over medium heat in a saute pan. Once melted, add onions, and continue to cook, stirring occasionally, until the onions are golden and caramelized, about 20 minutes. If the onions start to brown, turn the heat down.
Once golden, add ¼ cup (65 grams) of Skrewball whiskey glaze and cook for an additional 2 - 5 minutes until no liquid remains. Set onions aside.
Add ground beef, salt, pepper, and ¼ cup (65 grams) of Skrewball whiskey glaze to a saute pan, and cook on medium high heat, breaking up the beef into small pieces with a wooden spoon, until browned on all sides. Drain any excess fat and liquid from the meat.
Heat oven to 350°F (175°C).
Slice Hawaiian rolls in half using a serrated knife. Place the bottom buns on a sheet pan lined with parchment paper. Layer half of the cheese slices on the buns, then top with cooked ground beef and caramelized onions. Layer the remaining cheese slices then cover with the top buns.
Brush the remaining glaze on top of the buns with a pastry brush. Optionally, sprinkle sesame seeds on top of each bun.
Bake for 10 - 12 minutes until the buns are slightly browned and the cheese has melted.
Slice sliders into individual buns, and serve immediately with pickles on the side.