Roll out Puff Pastry (or defrost completely if frozen) lightly roll to smooth out. Spread with cream cheese mousse and top with salami slices, then slice into 9 or 10 strips lengthwise.
Fold the strips of dough accordion style, start with a small amount and widen as you go (until you reach the end).
Place a long skewer in the center starting at the base then through to the top of the tree. Place on a parchment paper lined cookie sheet.
Pre-heat the oven to 350F/180C. Chill the puff pastry appetizers while the oven is pre-heating 15-20 minutes.
Remove the appetizers from the fridge and bake for approximately 15 minutes or until golden. If desired top each tree with a green olive and stick into a large hard square of cheese or serve as is. Enjoy!
Notes
You can prepare the appetizers ahead of time. Freeze the unbaked crescents on a baking sheet, covered with plastic wrap. They will last for up to 1 month in the freezer. They can be baked straight from the freezer to the oven, they will probably need a couple of minutes extra for baking.Because puff pastry can become soggy it is probably best to eat them as soon as possible. Although if you do have leftovers be sure to refrigerate in an airtight container. They will keep for up 2-3 days in the fridge.