Preheat the oven: Preheat your oven to 180°C / 350-375°F / Gas Mark 4-5.
Thaw the pastry: remove the pastry from the freezer and place on the bench to thaw.
Whisk the egg: crack 1 egg into a small bowl and use a small fork to whisk, then set aside (for brushing the sausage rolls before cooking).
Combine the filling: use the blitz blade of the food processor, place beef mince, shredded carrot, dried onion, dried thyme, sriracha sauce, salt and pepper into the bowl and blitz for 10 - 15 seconds to combine.
Fill the pastry: working one sheet at a time, lay a sheet of puff pastry onto a chopping board. Spoon the beef mince filling onto the pastry and wrap the pastry around to cover. Have a slight overlap where you close the sausage rolls. Seal this overlap with the whisked egg.
Cut into individual portions: use a knife to cut the long sausage roll log into 5 even pieces. Place these onto the silicon baking mat. Repeat this process to use up all of the beef mince filling.
Brush with egg: use a pastry brush to coat each sausage roll with egg. Sprinkle dried thyme over each.
Oven Bake: place the baking trays into the oven and cook the sausage rolls for 20 to 30 mins. The pastry will turn a lovely golden yellow during this time.
To serve: serve the sausage rolls hot with either tomato or BBQ sauce (or both!)