Make sauce: I place all sauce ingredients into a food processor and mix well. This makes plenty, no need to double it. It also makes chopping the onion easier.
To assemble sliders, lightly grease your baking dish and layer the bottoms of the slider rolls in the pan. Layer your ham across the bottom buns, then layer the Swiss cheese on top of the ham. Smear the sauce on the under side of the top bun and place them on the sliders.
1 package slider rolls, 8 oz sliced ham, 12 slices sliced Swiss cheese
Melt your topping butter and mix the seasonings in. Brush the tops of the buns.