In terms of the veggies, you could simply cook them in the simmering curry, but that gives you less control over the ‘doneness’ of the individual elements and it affects the color of the green veggies. I personally prefer to bake the butternut squash and aubergine in the oven and to steam, the sugar snaps peas and broccoli. I baked the butternut squash and aubergine in a 210° C / 410° F (190° C / 375° F with fan) oven for about 20 minutes (turning them once, after 10 minutes) after coating them in a bit of olive oil. I steamed my sugar snap peas for 2 minutes and tender stem broccoli for 5 minutes.