Instructions:
Heat the oven to 350 degrees.
Add the ground beef and onion to a skillet over medium high heat on the stove.
Saute until the meat is browned and onions are tender. Drain the excess far.
Stir the water, brown sugar, apple cider vinegar, worcestershire sauce and beef bouillon cube into the skillet with the beef and onions. Bring to a boil, and then reduce heat and simmer until the liquid is almost gone.
Place only the bottom of the slider buns into a well greased baking dish, and top with the meat mixture, pickles and then cheddar cheese.
Add the tops of the buns.
Stir together the butter sauce ingredients, and brush it onto the tops of the slider buns.
Cover with tin foil and bake for 25 minutes before serving.