In a food processor, combine oil, egg, black beans, mushrooms, onion, red bell pepper, lime zest, lime juice, garlic, black pepper, Jalapenos, and bread crumbs on a rough chop setting.
You do not want to puree this.
Move to a bowl and complete the formation of a loaf by using your hands to mix.
In a small bowl, mix the tomato puree/juice, honey, paprika, cayenne, and horseradish to make the glaze.
Form 2T size balls of filling and press into a patty.
Cook for 4-5 minutes over medium-high heat on a grill or in a non stick skillet, brushing the patties with the glaze each time you turn them.
The burgers will be done when the center is no longer gooey. Use a toothpick to check. It will come out clean.
Assemble the sliders with the Tomatillo Pickles on top and add another drizzle of glaze.