Red Plum Jam 2

Was browsing through some jam/preserves recipes, particularly the methods.  This method seems to be an easy way to make nice jam and I hope the sweetness is acceptable to all.

Ingredients
[makes about 2 bottles x 400 gm]
500-550 gm red plums - washed and seed removed, cut into small pieces
300-350 gm sugar
2 tbsp lemon juice

1. Place a saucer in the freezer [for testing if jam is ready].
2. Mix sugar with cut fruits until sugar melts.
3. Place mixture in a heavy base pot or non-stick pan.  Add in lemon juice.
4. Bring to a boil then simmer until jam gels up [stir the jam occasionally throughout the cooking].  This takes about 30 minutes.
5. Spoon a little of jam onto cooled saucer.  Return to freezer for about 3-5 minutes.  If the jam wrinkles up when push with a finger, the jam is ready.
6. Store jam in sterilised glass container.  Refrigerate jam.