To make green tea extract, put the green tea leaves or tea bags in the hot water. Leave time to allow the tea to brew.
Take out the tea leaves or tea bags and cool down the green tea with ice.
Add the lemon juice and sparkling water to the chilled green tea extract. Mix well.
Put some slices of lemon and some ice cubes in a glass and pour the green tea lemonade soda.
Serve with a straw.