Prepare the fruit and sirup as for cooking in the oven.
Fill the sterilized jars and put the covers on loosely. Have a wooden
rack in the bottom of a wash boiler (see p. 10). Put in enough warm
water to come to about 4 inches above the rack. Place the filled jars in
the boiler, but do not let them touch one another. Pack clean white
cotton rags, or perhaps better, cotton rope, between and around the jars
to prevent them from striking one another when the water begins to boil.
Cover the boiler and let the fruit cook ten minutes from the time the
water surrounding it begins to boil.
Draw the boiler back and take off the cover. When the steam passes off
take out one jar at a time and place in a pan of boiling water beside
the boiler, fill up with boiling sirup, and seal. Put the jars on a
board and do not let cold air blow upon them. If screw covers are used
tighten them when the glass has cooled and contracted.