Cold Curried Chicken

INGREDIENTS:

1/3 c Finely chopped scallion
-(about 3)
1/3 c Chopped onion
2 ts Finely grated peeled fresh
-gingerroot
1 tb Unsalted butter
1 1/2 ts Curry powder
3/4 lb Carrots; peeled and sliced
-thinly (about 2 cups)
1 1/4 c Low-salt chicken broth; hot
1/2 c Canned unsweetened coconut
-milk, (up to 3/4)
2 ts Fresh lime juice plus
-additional to taste
Ice water for thinning soup