Mustard Batons

Directions

1. 1
   Heat oven to 400 degrees.
2. 2
   Line two baking sheets with parchment paper or baking mats.
3. 3
   On a lightly floured surface, roll out one sheet of pastry into a rectangle, about 12 by 16 inches.
4. 4
   Turn so that a short side is facing you.
5. 5
   Spread half of the mustard over the lower half of the rectangle, leaving a 1/8-inch margin around the edges.
6. 6
   Fold the top half over the lower half.
7. 7
   Using the tip of a sharp knife and a straight edge (such as a clean ruler), cut it into 1-inch-wide strips from top to bottom.
8. 8
   Transfer to prepared baking sheets, leaving a bit of space between batons, and refrigerate until ready to bake.
9. 9
   Repeat with remaining pastry and mustard.
10. 10
    Beat the egg with a splash of cold water, and brush mixture lightly onto batons.
11. 11
    Sprinkle with poppy or sesame seeds, if using.
12. 12
    Bake about 15 minutes, rotating pans after 8 minutes, until puffed and golden brown.
13. 13
    Let rest a few minutes before serving.