1-Preheat the oven: Preheat the oven to 400°F and line a baking sheet with parchment paper or a silicone baking mat.

2-Whisk together the egg wash: Whisk together the 1 large egg and 1 tablespoon water to make an egg wash; set aside.

3-Prepare the almond filling: In a food processor or stand mixer, combine the 8 ounces almond paste, ¼ cup granulated sugar, and 2 teaspoons vanilla extract until smooth.

4-Prepare the pastry: Unfold the 1 sheet puff pastry on the prepared baking sheet and gently roll it out slightly thinner and larger.

5-Cut the pastry strips: Cut one-inch-wide diagonal strips on both long sides of the pastry without cutting through the center.

6-Add the almond filling: Spread the almond filling down the center of the pastry.

7-Braid the pastry: Fold the strips over the filling alternately from each side to create a braided effect.

8-Brushing and topping: Brush the pastry with the egg wash and sprinkle the ¼ cup sliced almonds on top.

9-Bake the pastry: Bake for 10 minutes at 400°F, then reduce the oven temperature to 375°F and bake for an additional 17 to 20 minutes until golden brown.

10-Cool and serve: Cool the pastry on the pan for 10 minutes before slicing and serving.