Step 1

Heat a tablespoon of the oil in a large non-stick frying pan. Add the liver and stir fry over a moderately high heat for 3 minutes until light brown – don’t cook for longer or the liver will become rubbery. Remove to a plate, leaving the juices in the pan.

Step 2

Tip the leek, red pepper and chilli into the pan with the rest of the oil and stir fry over a high heat for 2 minutes. Add the oregano, garlic and greens and stir fry for a further 30 seconds or so, until the greens have just wilted and turned a nice bright green.

Step 3

Return the liver to the pan, add the orange zest and juice, sherry, then season. Toss everything together on a high heat and serve immediately.