In a large mixing bowl, combine beef mince with seasoning ingredients. Mix until well combined.
To wrap a cheeseburger spring roll, place a spring roll pastry sheet onto the working surface diagonally, with a corner pointing towards you. (note 1)
Spoon ~1 tablespoon worth of beef mixture onto the corner that's pointing towards you, about halfway down the middle of the pastry. Shape the beef mixture into a thin log. Add ~1.5 tablespoon worth of cheese along the beef log then top with tomato sauce and mustard sauce (if using).
Fold the bottom corner of the wrapper up and over the filling, tucking it in tightly to create a snug roll.
Fold the left and right corners of the wrapper in toward the centre, then continue to roll the wrapper tightly upward.
With one hand holding down the almost-rolled pastry, use the other hand to dampen the remaining unfolded top corner with a little water. Roll over and seal the cheeseburger spring roll closed.
Repeat for remaining rolls.