Preheat oven to not 200 degrees celsius fan-forced (or 220 degrees if conventional).
Grate carrot and zucchini and remove any excess liquid through a strainer. Place the drained carrot and zucchini into a bowl.
Add the chopped onion, sausage mince, beef mince, garlic, tomato sauce and BBQ sauce to the bowl. Mix together until well combined.
Cut each sheet of defrosted puff pastry in half.
Whisk the egg lightly. Using a pastry brush, lightly brush the egg mixture down one long side of each pastry half.
Place 1/12th of the sausage mixture in a long thin line down the opposite side.
Roll the sausage rolls into a long thin roll. Make sure the joined pastry seam is facing down.
Cut each roll into 6 pieces.
Brush lightly with the egg mixture. Sprinkle with sesame seeds or black poppy seeds.
Place the sausage rolls onto non-stick baking trays.
Cook in the oven for 25-30 minutes or until the pastry is golden and puffed and the mixture is cooked through.