Broccoli Bisque

2 tablespoons butter
1 1/4 to 1 1/2 bunches fresh broccoli,
    trimmed and chopped
1 medium onion, coarsely chopped
1/2 to 1 teaspoon curry powder
1/2 teaspoon salt
Dash of freshly ground pepper
3 1/2 cups chicken broth
2 tablespoons lime juice (or lemon)

Melt butter in a large saucepan over medium heat. Add broccoli, onion and curry powder. Saut