Pressure cooker pot roast beef fillet

Pour olive oil in the pressure cooker, not too much, just enough to cover the bottom well and sauté the onion slightly.

Add the beef slices and brown well on both sides.

Stir in the lemon juice and the wine and as soon as it has boiled for a couple of minutes add a tbsp of mustard, the zest, plenty of oregano, salt and freshly ground pepper. If you see that the liquids don't cover the meat add a little water (careful, not too much because it doesn't evaporate easily from the pressure cooker and you will end up with a soup!). Lock the lid of the pressure cooker and when it starts to boil turn the heat down.