MIXED BERRY JAM
Raspberries - about half cup
Blueberries - about half cup
Apple - half, peeled, cored & chopped into small cubes
Sugar - 1.5 cups (adjust based on sweetness of fruit)
1) In a fairly deep pot, combine the strawberries, raspberries & sugar and put it on the stove on medium heat until it comes to a boil.
2) Add the chopped apple & blueberries and continue boiling the mixture for about 20 minutes or so, stirring often until it reaches 220F on the candy thermometer. I like a bit of texture in the jam so mashed the fruit a bit with the back of the spoon and didn't make it smooth.
Allow to cool completely before storing in an airtight (glass) container/bottle and refrigerating.
NOTE: I would highly recommend buying/using a candy thermometer because it's inexpensive (approx US$4) and takes out a lot of the guesswork about the right time to pull things off the stove.