Prepare the strawberries by washing and drying them. Cut off the stems, slice into halves and place into the large saucepan.

Add granulated sugar and water into the saucepan and allow to simmer for 20 minutes. Skim off the foam as you see it.

Strain the syrup and do not mash down the strawberries. You do not want cloudy strawberry syrup. Allow to cool.

While the strawberry syrup is cooling, prepare your brewed green tea however you like and then allow that to completely cool.

Place ice cubes, strawberry syrup, green tea, and seltzer into a glass.