Preheat the oven to 350 degrees. Prepare a baking sheet with parchment paper and set aside.
Roll out defrosted puff pastry dough on a floured or non-stick surface until it is 1/4″ thick.
With a sharp knife, slice your dough vertically into 1″ strips.
Slice all the strips horizontally so that you have two rows of 10 strips each.
Combine the duck sauce and mustard in a bowl. Mix well.
Using your silicone basting brush, liberally coat the pastry dough with the duck sauce mixture.
Working with one or two pieces of dough at a time, place a slice of pastrami over a slice of dough and align it so that it doesn’t overlap. You may need to trim the dough or the pastrami.
Holding both ends of one dough/pastrami layered slice taut, twist both ends at the same time until the full slice is twisted. Place gently onto prepared baking sheet.
Repeat until all twists are completed.
In a small bowl, combine beaten egg with honey and whisk.
Brush egg and honey mixture onto the twists, only onto the exposed parts of pastry dough.
If you are using sesame seeds, sprinkle them onto the exposed parts of pastry dough.
Bake uncovered at 350 degrees for 25-30 minutes, or until golden brown.