Ingredients

•          500g pack penne
•          2 large leeks , sliced
•          85g butter
•          85g plain flour
•          2 tsp ready-made English mustard
•          good grating nutmeg
•          1l milk , plus a bit extra
•          350g pack mature cheddar , grated
•          4 slices French bread , diced
•          85g walnut piece
•          400g bag spinach
•          STEP 1

Method

If you are eating one of the pasta bakes now, heat oven to 190C/170C fan/ gas 5. Boil the pasta with the leeks for 10 mins, then drain.

•          STEP 2

Meanwhile, put the butter, flour, mustard, nutmeg and milk in a large pan with some seasoning. Gently heat, stirring all the time, until bubbling and thickened, then cook for 2 mins more, stirring frequently. Remove from the heat and stir in two-thirds of the cheese. Toss the remaining cheese with the bread and walnuts.

•          STEP 3

Cook the spinach in the microwave, or pour a kettle of boiling water over it to wilt, then squeeze out the excess water. Stir into the sauce with the pasta, leeks and some seasoning. If necessary, add a little extra milk to loosen. Divide between 2 ovenproof dishes and scatter the bread mixture on top. If eating straight away, bake for 40 mins until golden, or cool to freeze.