【Ingredients】：

Lemon, 

grapefruit, 

orange, 

dragon fruit

【Step】:

1. First prepare a bowl of water, add a spoonful of salt, wash the fruits, wash off the wax and dirt on the surface, and control the moisture；

2. Cut off the hard shells on both ends of the fruit and cut into thick slices about half a centimeter thick, a little thicker and more chewy；

3. Lemon, grapefruit, orange and dragon fruit are more suitable for soaking in water. It takes about 12 hours to bake the fruit at 60 degrees. After a cup, vitamin C is full.