Heat the oven to 200c.
Blitz the tomato, onion, carrot, celery together with the garlic, paprika, oregano and some salt and pepper. Bring to the boil in a pan and simmer for a couple of minutes while you make the bechamel.
Melt the butter in a pan and whisk in the flour. Season and gradually whisk in the milk on a gentle heat. Add the bay leaf and nutmeg and cook for a few minutes until thickened.
Blanch the potato slices in boiling water for two to three minutes. Drain and set aside.
Line the bottom of a lasagne dish with a layer of potato followed by half the pork and half the tomato sauce. Top with some bechamel and repeat with another layer. Finish with potato and bechamel and a good grating of Parmesan.
Bake in the oven for half an hour until golden on top.
Serve with buttered shredded savoy cabbage.
3 large Rooster potatoes (about 550g), finely sliced lengthways
500g leftover cooked roast pork shoulder, shredded
1 tin chopped tomatoes (400g)
1 red onion, chopped
1 small carrot, chopped
1 celery stick, chopped
1tsp garlic paste
2tsp smoked paprika
2tsp dried oregano
300ml skimmed milk
1 fresh bay leaf
A grinding of nutmeg
Salt and pepper
Parmesan, grated, to top.