Pour 3 cups of vodka into each of two 1-quart mason jars. Add three tea bags to each jar. Screw on the lids and allow the vodka to stand undisturbed for one hour.

Remove the tea bags (be sure to squeeze out all the vodka and add it back to the jars!). Add 1/2 cup of simple syrup and the juice of one lemon to each jar. Screw on the lids and give the vodka a good shake. Taste, and add up to another 1/2 cup simple syrup to each jar.

The vodka will keep for up to a year, stored in a cool, dark place.