This is an instant Kuzukiri of Sasaya Iori in Kyoto.
Just like Tokoroten, but Kuzukiri is made of Kuzu (herb) and eaten with brown sugar syrup. Tokoroten is made of Kanten (sea weed) and eaten with vinegar, soy sauce and mustard (sometimes with Aonori, sea weed) . Both are hallmarks of Japanese cold jelly sweets in the Summer.