Add the mushrooms to the bowl of a food processor and blitz until finely chopped. Add the oil to a large fry pan on medium heat and add the onion. Cook for about 4-5 minutes until translucent. Add the mushrooms and cook for a further 5 minutes. Add the garlic and thyme and stir for 1 minute before adding the lentils, flaxseed meal, salt and stock. Cook for 5-6 minutes until the stock is almost cooked out. Transfer to a heat proof bowl and add the Dijon mustard and panko breadcrumbs. Mix until well combined and allow to cool to room temp.
Preheat your oven to 200°C / 390°F. Line two baking trays with baking paper and set aside.
Place one of the pastry sheets on to a cutting board and use a sharp knife to cut them in half so that you end up with 2 rectangles. Add some of the mixture, about 1/8 on one end. Tightly roll up. Use a sharp knife to cut in three pieces.
Place on the baking tray with the seam facing down. Brush with plant-based milk and sprinkle with sesame seeds. Spray with oil spray and bake for 30 minutes. Allow to cool for 10 minutes before serving with tomato sauce.
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Notes
LentilsMake sure you wash and dry the lentils well. They helps add body to the filling, but left unwashed, they can make you feel gassy and bloated.MushroomsMake sure you wash you mushies well and dry them well otherwise your mixture will end up soggy.StorageSausage rolls can be stored in an airtight container for up to three days.ReheatingReheat in the oven on 200°C / 390°F for 10 minutes.