Brush the pork with the oil. Use an oil with a high smoke point, not olive oil or butter. Fry in the pan for 4 minutes each side, then remove and set aside to rest. If your meat starts to curl, place a saucepan half-filled with water to hold it flat, ensuring even cooking.

Remove the pork from the pan and allow to rest. Turn the heat down to low, add the oil and butter. Slice the onion quite thickly. Cook low and slow for 5 minutes then add the sugar and half of the vinegar to encourage caramelisation. Cook for a further 5 minutes

Deglaze the pan by adding the rest of the vinegar and scraping the bottom with a metal spatula. Put the meat back into the pan, increase the heat to medium low, then stir in ¾ of the gravy. Bring to a nice simmer stirring all the time, then cook for a further 10 minutes turning the steak once until nicely reduced.

If your gravy starts to thicken too much add some more from the jug. When it's just the right consistency cover the pan and remove from the heat. If your pan doesn't have a lid, use a lid from another pan or aluminium foil. Set to one side while you prep your veg.

When your veg is ready, season, plate up, serve, and devour