Pour 3 tablespoons of Raspberry or Chocolate Syrup or 1 teaspoon vanilla plus 3 tablespoons heavy cream in a tall ice cream soda glass. Whisk with a fork, then slowly, while still whisking, add the club soda until the glass is three-quarters full. Add 2 scoops of ice cream, add soda to the top of the glass, and serve with a spoon and a straw.
Combine the cocoa, salt, sugar and 1 cup of water in a medium saucepan and bring to a boil. Add the coffee granules, and simmer for 5 minutes. Pour the syrup into a bowl and add the vanilla. Cover and refrigerate until ready to use.
Combine the raspberries, sugar, and lemon in a container. Cover and refrigerate for at least 2 hours, or overnight. Strain the syrup into a pitcher, pushing down on the berries to extract all the liquid.