Soak glass noodles in warm water for one minute. Then strain and cut into short pieces.
For the filling, wash carrots and cut into very thin strips. Clean Chinese cabbage and cut into fine noodles. Peel onion and cut into very thin strips (or rings). Mix vegetables with yolk, salt and glass noodles.
Dip rice paper briefly in warm water. Place a little filling in the center of each rice paper sheet and wrap as follows: Roll up filling twice, then fold rice paper corners inward to form a triangle, finish rolling up.
If necessary, fix the rolls with some kitchen twine and fry in hot fat for about 4 minutes.