Preparation:
1. For the filling, mix together crab meat, spring onion, mayonnaise and seasoning.
2. Put the filling on the center of the wonton sheet. Fold the wonton into a triangular shape by putting one corner of the sheet to the opposite corner. Seal all the sides with water, make sure the sealing is well closed. Place the wonton in boiling water. When done, take off the boiling water and put in a bowl of cold water. Strain.
3. To make the soup, heat dashi stock in a soup pan. Add miso paste, cream, sake and butter. Strain the soup and then heat, adding the wontons when boiled. Pour into serving cups and sprinkle with paprika.