Bitter Green Salad with Roasted Pears

8 firm, ripe Bosc pears (4 lb.), peeled, cored, and cut lengthwise into 8 wedges 1-1/2 T. extra virgin olive oil 1 head of radicchio 1 bunch of watercress, coarse stems discarded 1 bunch of arugula OR 1 small head of chicory and 1 small head of escarole and 1 bunch mizuna, coarse stems discarded* […]