I was given this recipe by an 88 year old lady,it was her mothers recipe.
2lbs.dark ripe plums.
2lbs demerera sugar.
1 teacup malt vinegar.
Wipe fruit clean & put one clove in each end of plum & push 3 small pieces of stick cinnamon into stone.
Place in jar with vinegar. Stand jar in a saucepan of water. When vinegar gets hot, gradually add sugar and cook.When the top plum is cooked,they are ready.This takes about 2hours. Keep topping up water in saucepan.
I adapted the recipe as follows:-
After putting cloves into plums, put aside.
Meantime warm vinegar stir in sugar & add a couple of broken cinnamon sticks. Keep stirring until sugar is dissolved. Place plums in syrup,bring back to heat & poach plums for about 4 minutes. Remove plums, place in sterilized jars. Bring syrup back to boil & boil until slightly thickened. Remember it will further thicken as it cools. Pour syrup over plums & seal. By this method I used a further 2lbs plums.
You will need wide-mouthed jars.