1 onion, roughly chopped
2 large tomatoes, deseeded and cut into small cubes
1 tsp Dijon mustard
250g/9oz penne
50²µ/1ΒΎ΄Η³ϊ plain flour
salt and freshly ground black pepper
2 tbsp olive oil
1 tbsp paprika
butter, for greasing
50²µ/1ΒΎ΄Η³ϊ butter
750ml/1 pint 6 fl oz hot milk (see tip)
100²µ/3Β½΄Η³ϊ Parmesan cheese, coarsely grated
3 skinless, boneless chicken breasts, cut into thin strips roughly the size of your little finger