Preheat oven to 200°C.
Cut two sheets of frozen puff pastry in half.
Spread each half with 2 teaspoons wholegrain mustard, leaving a 2 cm border.
Place one of your favourite sausages along long edge of each piece of pastry.
Roll to enclose and brush with a lightly beaten egg.
Cut each roll in half and place on a baking tray lined with baking paper.
Cook for 20 min, until pastry is puffed and golden and sausages are cooked.
Serve with KNORR Brown Onion Gravy and mashed potato and peas.