Start by making Simple Syrup. Take sugar and water in a saucepan. Bring it to a boil and mix till sugar is dissolved. Simmer for 5 mins. Switch off the flame and allow it to cool down. Store this in a clean sterlized bottle and keep in fridge till you need it.
Now make lemonade by mixing all other ingredients in a tall glass and enjoy immediately.
Notes
You can keep the simple syrup in fridge and enjoy it whenever you need it. You can store this upto 3 months or more when properly refrigerated.