Rinse the cucumber well under running water. Using a vegetable brush scrub well. Optionally you may spray some vinegar and rub with sea salt to get rid of the bacteria and dirt. Rinse throughly.
Rinse and peel ginger. Also rinse the mint leaves under running water. Slice both the ends of cucumber.
Optional - Rub the sliced ends with the cucumber for a minute until you see some frothy substance, this step helps to take away the bitterness from the cucumber. (check picture in the post)
Chop the cucumbers and them to a blender along with salt, ginger, ice cubes, and mint. Strain this through a fine mesh strainer.
Mix in salt, lemon juice and chaat masala or cumin powder (optional). Serve cucumber juice immediately.
To make in a cold press juicer, start your machine and add the whole cucumber into the chute along with other ingredients. Squeeze lemon juice, chaat masala and salt if desired. Serve fresh. Keeps good in the refrigerator for 2 days.