FOR THE DRESSING: Cook the cider, and cinnamon stick in a saucepan over medium heat, stirring occasionally, 10 minutes or until cider is reduced to 1/4 cup. Remove from heat, and cool completely (about 20 minutes). Transfer cider mixture to a bowl, discarding cinnamon stick. Whisk in vinegar and next 6 ingredients. Add oil in a slow, steady stream, whisking constantly until smooth. Set aside. FOR THE SALAD: Cut apples into 1/8-inch matchsticks; toss with 2 tablespoons of the lemon juice. Peel and quarter avocados; toss with 1 tablespoon of the remaining lemon juice. Toss together the lettuces and arrange on a large serving platter. Arrange apples, cheese bacon, walnuts and avocado over salad greens. Drizzle dressing over finished salad.