2 tbs. finely chopped fresh parsley, plus 10 small sprigs
4 fresh or dried bay leaves
1 tbs. finely chopped fresh thyme, plus 4 sprigs
4 large leeks, white and light-green parts halved lengthwise, then sliced crosswise into 3/8-inch pieces (about 4 cups) and rinsed; dark-green parts from 1 leek rinsed and reserved