Preheat the oven to 200c.
Lightly fry off the onions until soft and lightly golden. Add the garlic and spinach and stir fry for 2 minutes then leave to cool.
In a large mixing bowl place the pork mince, couscous, tomato puree, Worcestershire sauce and egg, then add the onion mixture. Season with salt and pepper.
Mix until well combined - the easiest way is to get in there with your hands!
Lay out the pastry into a baking tray. Place the sausage mixture in the middle of the pastry and shape into a log. Leave enough pastry at each end to fold over the end of your log (approximately 5-7cm) and enough pastry at the sides to fold over the sausage mixture.
Starting from the top of the sausage mixture, cut diagonal strips down the length of the log approximately 1.5cm apart.
Fold the pastry over each end then starting from the top, fold each pastry strip over the log, alternating from one side to the other, creating a plait pattern as you go down the log.
When you have finished folding the strips across the log, tuck the remaining pastry in at base and then brush the pastry with an egg wash.
Place the plait in the centre of the pre-heated oven and bake for around 45 minutes until cooked, checking throughout the cooking that the pastry is not burning.
Original recipe: https://connieconsumes.com/2015/03/sausage-plait-recipe/