01 -
Using a meat mallet or something similar, smoosh the steak until it’s about 0.75cm thick. Then, cut it into thin strips, roughly 0.5cm wide. Sprinkle with pepper and salt.
02 -
Pour oil into a hot pan, get it sizzling, and cook the beef in two lots. Spread them out, then let each side cook just until browned, roughly 30 seconds per side. Pink in the middle is good! Move the beef to a plate.
03 -
Turn that heat down, pop in the butter, and wait for it to melt. Throw in your sliced onions first, stir for around a minute, then add those mushrooms. Let them cook together until golden brown, all while scooping up the browned bits stuck to the pan.
04 -
Sprinkle the flour over the cooked onions and mushrooms. Stir well for a bit, then pour in the beef broth slowly, stirring all the way. Mix the Dijon and sour cream in, then let it simmer gently for 3-5 minutes while stirring to thicken it up.
05 -
Tumble the beef and all its juices back into the pan, giving it a quick warm-up (a minute should do). Turn off the heat and serve over your cooked noodles or pasta. Fancy it up with some chives if you're in the mood.