Quick and Easy Steak Sauce:
Simmer ketchup, soy sauce, broth, apple cider vinegar, mustard, hot sauce, and brown sugar in a small saucepan over medium heat until very thick, about 10 minutes.
Steak:
Preheat oven to 400°F.
Heat a heavy duty sauté pan, lightly coated with evoo, over high heat.
Caramelize onion until deep golden brown. Add mushrooms and continue cooking until mushrooms are golden brown.
Heat latkes in preheated oven.
Add garlic and thinly sliced beef to the pan. Cook, stirring constantly until beef is medium rare, about 3 to 5 minutes.
Pile meat on latkes and top with steak sauce.