Loganberry jam

Description
Loganberries are larger and more acid than raspberries with a hardish hull and when fully ripe are a dark purplish red.
 * Makes 5 lbs

Ingredients

 * 4 lbs loganberries
 * 4 lbs sugar

Directions

 * 1) Crush the loganberries slightly with a spoon, then warm them.
 * 2) Add the sugar, stir this well in, then boil quickly until the weight of the jam is 5 lbs or will set when tested.
 * 3) Skim and pot as usual.