Prepare and measure watermelon and strawberries.
Now in a blender, I am using vitamix, add watermelon, strawberries, mint, ginger, lime/lemon juice, cumin powder and black salt. Start with adding 1 tablespoon of Sugar or Sweetener of your choice. Add more if required. Add 4 Cups of Chilled water. (Just pulse everything without water if you are planning to make it as a cocktail. )
Pulse on high speed. Once all the ingredients come together. Give it a taste. Adjust the sweetness as per your taste. If you add more sweetener, pulse it one more time.
Now, you can sieve the juice or leave it out. I sometimes do sieve it and other times I don't. I recommend to sieve it for a smooth texture of juice if serving to guests or planning to add a little booze to it.
Serve chilled.