1. Wash wax gourd, peel and flesh, and set aside.
2. Cut wax gourd into 1.5cm cubes.
3. Cut off the four corners and edges of square wax gourd with a knife.
4. Change to the shape of a ball.
5. Cut all the wax gourd in turn.
6. Blanch wax gourd balls in water.
7. Blanch until it is crisp. Remove the water and put it in a bowl.
8. Add 1 / 4 teaspoon salt and 1 / 2 teaspoon sugar to wax gourd balls.
9. Pour in proper amount of white vinegar.
10. Squeeze the orange and pour it in.
11. Stir well with a spoon.
12. Wrap with plastic wrap and refrigerate for about two hours. Take out and serve.