Sweet potatoes are in my seasonal repertoire this time of year, so I'm always on the lookout for new ways to enjoy them. When roasting, leave the skins on for greater nutrition (and better texture). High heat muddies the fresh flavors of the herbs and lemon zest in pesto, so top it on just before serving.
Whole-grain spaghetti gets striking color from a quick toss with pureed beets (a prime source of the phytonutrient betalain). Sun-dried tomatoes -- richer in lycopene than fresh ones -- lend the sauce a caramelized sweetness.