1- In your pan melt butter with a hint of oil then sauté your mushrooms, salt and pepper them, then when they are cooked remove them to a bowl.
2- In a saucepan pour your diced shallot, your coarsely ground pepper, and the wine vinegar, let it reduce completely then add your wine sauce, bring back to a boil and keep to the side.
3- Cut your potatoes in half then insert a garlic clove, melt some butter and olive oil in a sauté pan then roast them in it, salt and pepper then set aside.
4- Your guests are about to arrive, in a pan put a good knob of butter with a drizzle of oil, heat well then sear your sirloin steaks 1 minute on each side, then remove from heat and place an inverted plate in this pan on which you will place your meat cutlets, salt and pepper them then cover with foil.
5- It's time to enjoy this dish so heat your sauce, pour the mushrooms into it and add the juices released by the meat, also reheat your potatoes then on a hot plate arrange your pieces of meat with the small potatoes arranged around and the mushroom sauce poured boiling over your sirloin steaks (this way they will be at temperature). And as you often ask us about wine pairings, you can also try the excellent Cahors from Clos Triguedina or its Probus from my friend Jean Luc Baldès.
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