This is a recipe that I found in a library book and plan to try soon. From "Perfect Preserves" by M. Dalton King.
- Wash and hull the strawberries, then cut each in quarters.
- Wash peaches. To peel, dunk them into boiling water, leave for 30 seconds to one minute, then immediately plunge into ice water.
- When peaches are cool enough to handle, remove the skin.
- Cut peaches in half and remove pit, then slice the fruit.
- Place the strawberries and peaches into a large pot.
- Stir in the lemon juice.
- Heat the fruit over medium heat until it begins to soften (about 10 minutes).
- Mash the softened fruit and add the sugars. (if using cinn stick, add now).
- Bring the mixture to a boil and let it continue to cook until thick (about 25-30 minutes) or until it reaches 221F on a candy thermometer.
- Watch your jam carefully to prevent scorching, stirring often.
- If you're worried or think you can smell the mixture starting to burn, turn the heat down and cook slowly until the jam tests done.
- Testing can be done by dipping a spoonful of the hot jam onto a china or glass plate that has been kept in the freezer.
- Give the jam on the plate a moment or so to cool and then see if it's gelling to your satisfaction.
- When the jam is ready, stir in the cinnamon and remove the pot from the heat.
- Let sit for 5 minutes, then skim off all the foam.
- Ladle the jam into hot sterilized jars, leaving 1/2 inch headroom.
- Wipe the rims clean, place lids and adjust the rings fingertip tight.
- Process in a hot water bath for 5 minutes.
- Cool completely, check seals and label.
- Store in a cool, dry, dark place for up to 1 year.