Preheat oven to 425° F. Peel and core the pears, then cut them into 8 wedges each.
Toss them with the first tablespoon of olive oil and spread in one layer on a large baking sheet. Season with salt and pepper.
Roast the pears, stirring and turning a couple of times, until they are tender and beginning to brown, 20 to 30 minutes. Cool.
Wash the escarole and mizuna. Tear away any thick ribs and discard. Tear the tender leaves into bite-sized pieces. Mix with the salad greens to make up about 8 cups total.
In a small bowl, whisk together the shallot, vinegar, honey, salt and pepper. Add the remaining ¼ cup of oil in a slow stream, whisking until smooth.
Toss the vinaigrette with the mixed greens and the roasted pears.
Divide onto chilled plates.