Plum Ketchup - cooking recipe

Ingredients

1 lb purple plums, pitted and cut into chunks
1 small onion, quartered
2 cloves garlic
2 tablespoons peeled ginger, chopped
1 cup brown sugar
1/2 cup cider vinegar
1/2 teaspoon cinnamon
1 pinch red pepper flakes
salt & pepper

Preparation

in processor pulse plums, onion, garlic and ginger until finely chopped.
put into a saucepan.
add remaining ingredients, heat to boiling.
lower heat and simmer uncovered, stirring occasionally until thickened, about 30 minutes.
cool and refrigerate.