For dressing, in a bowl, combine the first 8 ingredients. Pour 1/4 cup into a large resealable plastic bag; add apples. Seal bag and turn to coat; refrigerate for at least 10 minutes. Cover and refrigerate remaining dressing until serving.
Drain apples, reserving marinade for basting. Thread onto 6 metal or soaked wooden skewers. Grill apples, covered, over medium heat for 6 to 8 minutes or until golden brown, basting frequently. Turn and grill 6-8 minutes longer or until golden and tender.
In a large salad bowl, combine the greens, walnuts and blue cheese. Add apples. Drizzle with reserved dressing and toss to coat.