Sweet Potato Supper

Excellent and dead easy though I do have an issue with the oven time and temperature - if I roasted asparagus tips at 220F for an hour (as per this recipe) what I would get is little bundles of charred fibres. I've noticed before, and not just in Nigella's recipes but others as well, that roasting times for vegetables are often much longer than work for me. Could be a problem with my oven, though in this case I don't think so.

Anyway, I used the stems of the asparagus (having put the tips in a risotto) and gave them 30 mins at 200F. I gave the sweet potato a 10-minute head start so total roasting time of 40 mins. Good squeeze of lemon at the end as an alternative to Nigella's suggestion of chilli sauce.