So, real quick, while the jars have their hot water bath-
Blackberry Peach Preserves
5 C peaches, pitted, pealed
3 C blackberries
1/2 C lemon juice
5 C sugar
In a large pot, combine peaches, blackberries, and lemon juice. Mash it up. Bring to a rolling boil. Add sugar all at once. Stir, bring back to boil over high heat. Stir! Stir for 10 minutes. Add 1 T butter to reduce foaming. Keep stirring.
For full instructions on safe canning, see http://www.pickyourown.org/allaboutcanning.htm
Ladel into sterilized jars. Hot water bath, 15 minutes.
(Recommended: Have some fresh preserves over some vanilla ice cream. Feel the love. Yup.)