1. Set oven at 425 degrees, and have on hand a lined baking sheet. Unroll the puff pastry and spoon half the mustard along one side, then place half the sausage on the mustard. Brush the rest of the pastry with the beaten egg then roll the pastry arounds the sausage. Cut the roll into 4 pieces then place on the lined baking sheet seam side down. Repeat using remaining ingredients.
2. Brush the tops of the sausage rolls with beaten egg then bake for 20 minutes or until pastry is brown and sausage is fully cooked. Allow to cool for 5 minutes before serving.
3. Place one wrapper on a cuting board and place 2 tablespoons of filling in the center.Brush edges of wrapper with beaten egg then fold wrapper around filling. Repeat with remaining filling and wrappers until all of both are fully used. Brush each egg roll with canola oil then place on lined baking sheet.