Leftover's used were sour cream and chive rolls, beef pot roast, and jus made from the pot roast drippings, all made from scratch.
I also thinly sliced a half red onion that was floating around in the fridge and caramelized it, and threw on some muenster cheese for good measure.
After I assembled the sliders, I griddled them on my cast iron skillet and used a second skillet to smoosh them a bit for better contact with the pan. All in all it took about 30 minutes, and most of that time was caramelizing the onions.
Looks banging. I'd snarf that down in short order.