Add the turkey to a large bowl along with 1/4 cup water. Season with salt and pepper, to taste, and mix to combine. Mold the turkey into 16 even-size slider patties. Heat 1 tablespoon of oil in a large griddle pan over medium heat. Add the patties and cook for 4 to 5 minutes per side. Be sure to not move them until they are ready to flip when brown on the first side.
Heat remaining 2 tablespoons of oil in a large saute pan. Add the onions and caramelize over medium heat, adding water as needed, to deglaze the pan. Add the BBQ sauce to the onions when they are mostly caramelized and cook for another 3 to 4 minutes.
Top each potato roll bottom with a turkey patty and spoon some of the BBQ caramelized onions over the top. Cover with the roll tops and enjoy!