The best grape cocktail

Ingredients:

1. 1 cup of grape juice
2. 2 cups of sparking water
3. 1 tablespoon of lemon juice
4. Sugar

Instructions:

1. Mix the grape juice with the lemon juice.
2. Add the mixture to the sparkling water and mix one more time.
3. Add a pinch of sugar to the drink and mix.
4. Cover the rim of the cup with sugar and pour the cocktail into those cups. (optional)
5. Serve.