Sour apple slush

My face as I did not understand what I had bought. 

On the ferry in Estonia between Virtsu and Muhu I bought this refreshing slush for me. It appeared to be sour apple. What an earth is that?

Holiday with hubby in Kuresaar, Estonia.

+13C at home early in the morning. 
Sunny +21c in Estonia continental area. Great! Saaremaa seems to have cloud on it, warm though.

Susanna