Heat 1 tbsp oil in skillet over med-high; pat steak dry, season with salt/pep + sear 4-5 min per side for med-rare (for more well done add 1-2 min per side); for best results, then use tongs to hold steak up on its edges for 1 min to render fat crispy; rest 5 min + slice in half; divide to plates + drizzle on 2 tbsp of sauce to each

Wash + dry ½ cucumber; thinly slice, cut onion in half from root to stem, peel + thinly slice ½ of onion

Wash + dry lettuce leaves, tear into bite-size pieces, add to a large bowl along with cucumber + onion, drizzle on 1 tbsp of oil + some vinegar salt + pep; add to plates