Spicy sweet potato wedges are LUSH! Also love sweet potato roasted with other veggies such as courgettes, peppers, onions etc (especially with a little harissa paste stirred through). Fab for soup aswell. Amazing in Curries......i also make a fab chicken or lamb and sweet potato one pot. Just fry off onions, celery, red pepper, with the meat, bung in tin of chopped toms, a tbsp tom puree, garlic, and whatever herbs take your fancy and a splash of balsamic vinegar and let it simmer away until tender.
Also sweet potato makes AMAZING mash...mmmm xx