Separate your cloves from the bulb of garlic. Peel and finely chop them.

Heat 2 tbsp of olive oil in a heavy-based casserole over a medium-low heat. Gently fry the garlic for 5 mins until softened and lightly golden, but don't let it burn.

Quarter your tomatoes, then pour them into the pan. Season well, then add the vinegar and cook slowly on a low heat for an hour, so the sauce has reduced to a deep, concentrated flavour.

Blitz the sauce with a stick blender until it is perfectly smooth. Tear up the basil leaves and stir through.

For the béchamel, warm the milk, bay leaf and a generous grating of nutmeg in a saucepan. Remove from the heat and leave it to infuse for 10 mins.

In a separate saucepan, melt the butter. Whisk in the flour, then cook out for 2 mins. Slowly add the milk bit by bit, whisking as you go to achieve a smooth consistency. Continue whisking until the milk is all combined and the sauce looks glossy.

Bring the béchamel to the boil slowly to thicken it, scraping the base of the pan with a wooden spoon to avoid scorching.

Tear up the mozzarella and add this to the béchamel. Beat with a wooden spoon until the mozzarella is completely melted. Season to taste with salt and pepper and a little bit more grated nutmeg.

Now make the filling. Heat 1 tbsp of olive oil in a pan set over a medium heat. Wilt the spinach for 2 mins. Remove from the pan and squeeze out any water from the spinach in a sieve over the sink.

Roughly chop your spinach and slice your leeks.

Melt the butter in the same pan and add the leeks. Sweat for 5 mins until softened.

Mix the crème fraîche and Castello Danish Blue together in a bowl, then add your spinach, leeks, nutmeg, salt and pepper until well combined. Season to taste with salt and pepper.

Transfer the spinach mixture into a piping bag, squeezing the mixture towards the nozzle so it is nicely compact and ready to pipe.

Preheat the oven to 200°C/400°F.

Pipe the filling into each cannelloni. Repeat until all the pasta and filling is used up.

Take a medium-size ceramic baking dish, (approx. 26cm), pour in half the tomato sauce, and then neatly arrange the filled cannelloni on top, packing them in tightly.

Press them down a little into the sauce so the cannelloni are partially submerged in the tomato sauce. Pour the rest of the tomato sauce on top, followed by the béchamel.

Grate over the Parmesan. Place in the hot oven for 30 mins until the cheese is delicious and bubbling.

Leave to stand for 5 mins before serving with a green salad and crusty bread.