Instructions

In a small saucepan, heat the oil over a low heat and add the onion. Fry gently for 10-15 mins until really soft. Stir in the onion marmalade, then take off the heat.
Cook the duck confit following pack instructions, then remove from the bone and pull into thick shreds, seasoning to taste.
Cut the buns in half and spread the cut sides with a little butter. Place on a griddle pan, butter-side down, over a high heat for around 1 min until griddle lines appear.
Spread the mustard on one half of each bun and onion marmalade on the other, then fill the buns with the shredded duck and some salad leaves. Serve immediately.