Squash, macaroni and Parma ham bake

Method

1. Preheat the oven to 220°C/fan200°C/gas 7. Put the squash in a shallow roasting tin with the garlic and lemon zest, then drizzle with the oil and season well. Roast in the oven for 25 minutes until soft. Reduce the oven to 200°C/fan180°C/gas 6.
2. Meanwhile, melt the butter in a small pan and whisk in the flour, then the mustard. Mix the milk and mascarpone, then gradually whisk into the flour paste. Simmer, stirring, for 5 minutes, then season.
3. Cook the pasta in a pan of boiling salted water for 7-8 minutes until al dente. Drain, return to the pan, then fold through the mascarpone sauce, lemon juice and most of the Gruyère. Fold in the contents of the roasting tin, the Parma ham slices and some seasoning. Spoon between 2 x 2 litre baking dishes and sprinkle with the remaining Gruyère (leave some squash and ham showing for colour).
4. Wrap one dish in cling film (once cool) and freeze for up to 3 months. Defrost fully, remove the cling film, then bake for 25-30 minutes until piping hot throughout.
5. Bake the other dish for 20-25 minutes until golden, then serve.