Winter pumpkins are a delicious addition to your cold season meal. Choose red or green compact versions of this special cultivar to cook Heaven-and-Earth Tempura Cakes or Pumpkin Puree with Ginger. Its distinctive bottom with a circular ridge, though, gives it away. On some, the ridge may surround a more pronounced bump, or "turban." A freshly cut buttercup may smell like a clean, fragrant cucumber, but once cooked, its orange flesh becomes dense, a bit dry, and very mild.