Sift the Matcha powder into a bowl, then pour in the warm water.
Whisk until completely smooth and lump-free.
In a pitcher, stir together the lemon and lime juice with the sweetener.
Add the dissolved Matcha, then pour in the cold water or sparkling water.
Serving: Pour into glasses over ice, then garnish with lemon or lime slices.
For a more visually stunning drink, you can also make a layered version where the Matcha slowly swirls into the citrus base.