Have you tried cold brewing?

Brewing with cold water is simple and easy way to make a liquor like drink.

First, get a mountain spring water in a plastic bottle, take a little water out to make a room for the green tea leaves. Put double amount of Gyokuro or high quality Sencha in the bottle, then lay it down in a refrigerator.

Wait for 24 hours, then you will be ready for a surprising taste of Umami essence in the green tea. You never tasted a green tea like it before.