Heat 1 tsp oil in skillet over med; thinly slice onion + sauté 8-10 min until browned; season with salt, add ¼ cup water; cover + cook 3-5 min until softened; divide onions + place 1-2 slices cheese on top of the 2 portions; cover 1-2 min until melted

Meanwhile, slice 2 buns in half; toast until warm + golden

Reserve sauce from short rib package; slice meat then add to skillet with reserved sauce; heat over med-low 2-3 min, turning often, until warmed through

Divide meat to rolls with cheese + onions; pour hot short rib sauce into 2 small bowls to serve on the side for dipping, that looks good!