This was originally a recipe for strawberry lemonade, but it's just as good with blackberries or raspberries.
NOTE - I prefer to mix the sugar and lemon juice together, then add to the jar.
To each pint jar add 1 cup of sliced berries, 1 cup lemon juice, 3/4 cup sugar, and fill the remaining space in the jars with water if necessary. Put on lids and rings; tighten, process in a water bath canner:
pints - under 1000' altitude - 5 minutes
over 1000' - 10 minutes
To serve - pour through strainer into pitcher, dilute to taste.
(Start with 2 pints water to 1 pint concentrate.)