In a tall glass (at least 16 oz.), layer scoops of firm strawberry-sour cream ice cream and 1/3 cup of fresh sliced strawberries.
In a 1-cup measure, mix 2 teaspoons sugar and 2 teaspoons raspberry vinegar until sugar is dissolved.
Add 3/4 cup chilled club soda. Pour mixture over ice cream in glass. Serve with a spoon and straw.