Preheat oven to 350 degrees F. Spread cranberries in a shallow baking dish and sprinkle with sugar. Cover dish tightly with foil and bake for 1 hour, stirring occasionally to prevent burning. Cranberries will shrivel and turn soft. Cool to room temperature, then refrigerate until well chilled.
For dressing: Whisk all ingredients together and refrigerate until serving.Wash and dry lettuce, tear into bite-size pieces. Add tangerine sections to lettuce and toss with as much dressing as you wish. Sprinkle candied cranberries on top, add pepper, and serve.