This drink is mentioned in "Anne of Green Gables" and the recipe comes from a website about Prince Edward Island.
19 Ounces frozen raspberries
1/4 Cups sugar
4 Cups boiling water
In saucepan add sugar to frozen raspberries and cook for 20-25 minutes, until sugar has dissolved. Then mash the mixture thoroughly.
Pour the mixture through a strainer and discard pulp.
Add the strained juice of two lemons, stir.
Add the 4 cups of boiling water. Let cool, then refrigerate.