Bake a medium sweet potato in the skin for 20 minutes at 180 degrees
Defrost your chosen sausages and add to a bowl
Finely chop the red onion and fry on a medium heat for 5 minutes until soft
Add in the crushed garlic and fry for a further minute and then transfer to the sausage bowl
In a dry frying pan, fry all the spices to release the flavours, then add to the bowl
Once the sweet potato is soft, remove from the oven and remove the skin. Leave to cool and then transfer to the bowl with the onion and spices
Add in the 2 tbsp of tomato puree and 2 tbsp of mango chutney and breadcrumbs. Mix until combined
Roll out your 'sausage meat' into two equal sausages, using the short edge of the pastry as your guide
Wrap your 'sausages' in cling film and pop in the freezer for 10 minutes to solidify
Once solid, place your sausage meat at opposite ends of the pastry and cut the pastry in half
Wrap the pastry around the 'sausage meat' and ensure the overlapping pastry edge sits on the bottom of the sausage roll
Cover with the oat milk wash and bake in the oven for 30 minutes or until golden brown
Reapply egg wash and sprinkle the Nigella and sesame seeds over the rolls. Place back in the oven for a further 5 minutes
Remove from the oven, allow to cool on a rack and serve with mango chutney