How to grate bottle guard (dudhi) easily and quickly ?

Here is method..... thus you can grate bottle guard easily without peeling. Try this....

Wash and wipe dudhi.

Cut into two parts. 

Cut this vertically into four pieces. 

Cut this vertically into total eight pieces.  Cut the all ends.

Then you can grate this easily without peeling. 

See this... and grate all pieces this way.