Sauté the onion and garlic lightly in the butter but do not brown. Add the zest and stir well. Transfer to a large pot or stock pot and add the remaining ingredients and stir well. Bring almost to a boil, lower the heat, and simmer for 15 minutes. Serve hot or allow to cool before serving.
Heat Scale: Varies
This is an exciting blend of fresh, light flavors that makes a great beginning-of-the-meal palate stimulator during the summer. It has beautiful color and a slight bite from the ginger. A thinly sliced lime wheel makes an excellent garnish when floated on the soup with a dollop of sour cream.