WASH and thoroughly crush about 3 quarts (3 L) ripe Saskatoon berries.
HEAT gently until juice starts to flow; simmer, covered, 15 minutes. Place in jelly cloth or bag and squeeze out juice.
MEASURE 3 1/2 cups (800 mL) into a large saucepan. Add lemon juice.
ADD sugar to juice and mix well.
PLACE over high heat and bring to a boil, stirring constantly.
IMMEDIATELY stir in pectin.
RETURN to a full rolling boil and boil hard 1 minute, stirring constantly. Remove from heat.
SKIM foam if necessary.
POUR quickly into warm sterilized jars filling up to 1/4 inch (0.5 cm) from rim.
SEAL while hot with sterilized 2-piece lids with new centres.