Making Christmas Sausage Rolls can be a fun and easy process. Follow these steps for delicious results:

1. Preheat Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare Filling: In a large bowl, combine the sausage meat, chopped onion, minced garlic, parsley, Dijon mustard, thyme, salt, and pepper. Mix well until fully combined.
3. Roll Out Pastry: On a lightly floured surface, roll out the puff pastry sheet to a rectangle about ¼ inch thick.
4. Cut Pastry: Cut the pastry into even strips, approximately 4 inches wide.
5. Add Filling: Place a line of the sausage mixture along one edge of each pastry strip, leaving some space at the edges.
6. Roll Up: Carefully roll the pastry over the filling to create a log shape, sealing the edge with a little water.
7. Cut Rolls: Cut the logs into bite-sized pieces, about 2 inches long.
8. Prepare for Baking: Place the sausage rolls on the prepared baking sheet, making sure there is space between each piece.
9. Egg Wash: Beat the egg and brush it over the tops of the sausage rolls for a golden finish. Sprinkle sesame seeds on top if desired.
10. Bake: Bake in the preheated oven for 25-30 minutes or until golden brown and cooked through.
11. Cool: Remove from the oven and let cool for a few minutes before serving.

These steps will guide you through making delicious Christmas Sausage Rolls that will impress your guests!