Leek and pumpkin soup with lime

Melt butter in pot over medium heat. Add leeks, garlic, and lime zest, and season with salt and pepper. Cook until very soft, for about 15 minutes.

Stir in the pumpkin pure, and add milk and water. Turn the heat to medium-high; when it starts to boil, turn down the heat to medium-low and simmer for about 20 minutes.

Blend the soup with a hand blender. Stir in lime juice and nutmeg, and season with salt to taste. Serve with lime wedges and a dollop of crme frache, if desired.