French Dip Sliders

"A classic French Dip requires slow-cooking a beef roast. I love French Dip, but it does require a bit of advance planning. I wanted to make something a little easier for these sliders, so I opted for deli-sliced roast beef. The caramelized onions and au jus dipping sauce are both important elements of a good French Dip, so I knew those needed to be included here! For the caramelized onions, I just sliced a couple of yellow onions and let ’em cook down while I assembled the rest of these French Dip Sliders. Not too bad, and those onions were good enough to eat by themselves! (I might’ve snacked on a slice or two.) And for the au just sauce, I created a shortcut version using beef stock and some seasonings. That sauce reduces down while the French Dip Sliders are baking."