What could I make with sour vodka?

I have developed a recipe for sour shots, and I had to use vodka with citric acid because without it I couldn’t get them both sour, fruity and strong enough, but now I may have leftover sour vodka.

The sour vodka uses the same strength as “super juice”, (60g per liter) as that makes the shots have the right balance of sweetness and acidity when mixed 50/50 with fruity syrup and shaken.