By Josceline Dimbleby
You can make this glowing casserole ahead of time and keep it warm, adding the courgettes at the last moment.
Put the saffron strands into a measuring jug and add 150ml (¼ pint) of boiling water. Leave it to infuse. Cut open the peppers, discard the seeds and stem and slice the flesh across very thinly. Chop the g