Heat 1 tbsp oil in skillet over med-high; add potatoes in a single layer + sear undisturbed, 2-3 min until browned; flip + heat 2-3 min until crispy + hot

Heat lightly oiled skillet over med-high; pat meat dry, season with salt/pep + sear undisturbed 2-3 min until browned; flip meat over + sear 2-3 min more for medium-rare

Divide beef + potatoes to plates; top potatoes with sliced red onion + chopped parsley, then drizzle with 1-2 tbsp sauce—looks great!