Grilled Rib Eye Steak & Red Onions

4 sandwich steaks (thin slices) olive oil , as needed steak seasoning, as needed 3/4 cup mushroom , champignon 8 slices rye bread French fries (optional) or[...]

4 plum tomatoes , halved lengthwise 3 tablespoons olive oil kosher salt and pepper 1 lb london broil beef , sirloin or 1 strip steak 2 medium onions , sliced[...]