Heat 1 tbsp oil in skillet over med; thinly slice onion + sauté 8-10 min until browned; season with salt + add 2 tbsp water; cover + cook 3-5 min until softened

Heat 1 tbsp oil in a large skillet over high; add ½ beef in a single layer + sear 1 min, push steak to the side + repeat the process; sauté 1-2 min stirring constantly until hot, season with salt/pep + fave seasonings

Toast 1 baguette until warm + golden; slice in half

Divide steak + caramelized onions to baguette; add a handful of arugula to each + drizzle on dressing, slice in half + serve with extra arugula salad on the side