Preheat oven to 200 C / 400 F. Line a large baking tray with baking paper. Set aside.
Place one puff pastry sheet on a flat surface.
Cut sheet in half horizontally.
Spoon ⅛th of the falafel mixture down along the long side of the pastry half.
Shape the mixture into long sausages.
Roll up pastry to enclose filling, finishing seam side down.
Brush with whisked egg. Sprinkle with sesame seeds (if using).
Repeat with the remaining pastry sheets, falafel mixture and whisked egg.
Place rolls, seam side on the baking tray, 2 cm apart.
Bake for about 20-25 minutes or until golden and cooked through.