3 steak sandwich mushrooms caramelized Recipes

sandwich steaks (thin slices), olive oil , as needed, steak seasoning , as needed, mushroom , champignon, rye bread, french fries (optional) or chips (optional), olive oil, onions, sliced into thin rings, water, brown sugar, red wine vinegar, butter

mayonnaise, white horseradish, prepared, butter (1/2 stick, divided ), beef tenderloin steaks, thick, onions, thinly sliced, shiitake mushrooms, stemmed, caps thinly sliced (about 5 cups), beef broth, croissants , halved horizontally, lightly toasted, arugula