Clean the greens and dry them with paper towels and/or a salad spinner to remove excess moisture.
Preheat oven to 400 degrees F.
Lay the pastry on a parchment lined baking sheet, and cut into 6 (4-inch) circles, removing the excess dough.
In a small bowl toss the apple slices with cinnamon, nutmeg, brown sugar and juice.
Brush the puff pastry with the egg wash and arrange the apple slices daisy-petal style on top of each circle.
Bake for 12 to 15 minutes, remove to a rack and let cool.
Place the vinegar, onion, chives, and oil in a container and shake to combine.
Toss the greens, tomatoes and candied walnuts in the dressing to coat, and season with salt and pepper.
Arrange the seasoned greens on top of the puff pastry and serve immediately.