• If you serve the steak with any side dishes, prepare them beforehand.

Prepare the Crust

• Peel and chop the onions very finely.
• Preheat a small pan and melt the butter over medium heat. Add onions and a pinch of salt, and fry until translucent.
• Add mustard and breadcrumbs and mix well. At this point, your crust is ready, and you can set it aside.

Prepare the Steak

• Preheat the oven grill to 200°C (392°F).
• Melt lard or oil in the cast iron pan on high heat.
• Fry steak for 2 minutes from each side.
• Remove the meat from the pan and put it in an oven-safe dish (I am using a place). Cover the whole surface of the steak with a mustard mixture (I am using a spoon and hands for this).
• Put the steak into the oven for 15 minutes. After 10, check if the crust is not getting brown too quickly.

Prepare the Gravy

• Preheat the cream in a small pan. Add the mustard and cook for 5 minutes. The sauce should thicken a bit.
• Keep it warm until your steaks are ready.
• After removing the steaks from the oven, add the meat juices from the plate to the pan with the sauce and mix well. Season your gravy with salt!