irst boil your potatoes in a pan of water for 20-25 minutes until tender

Next break those potatoes up with a fork and add your grated mature cheddar on top and mix, season with salt & pepper - leave on onside to cool

Then sauté your leeks in a frying with garlic in a drop of olive oil, over a medium heat for approx 10 minutes until soft - tip them out into a dish again leave to cool, season

In the same frying pan add another teaspoon olive oil and sauté your onions for approx 8 minutes - they need to be soft, don't burn them

Preheat your oven 200C/400F/Gas 6

Remove your pastry from the fridge and unroll the sheet

Pile your potato and cheese mix down the centre in a sausage shape and make a 'trough' down the middle (you could say a ditch) and fill with your leeks

Finally top with your red onions

Next using a knife slice 2cm slices down your pastry and simply lift one over the filling then another from the other side and continue until the whole Cheese & Onion plait is covered.

Using a fork crimp / seal the ends Egg wash the while plait, lift onto a baking tray and bake at 200C for 35-40 minutes until golden brown and your pastry is baked

Remove from the oven and slice and enjoy