Remove the pits from the cherries, make sure you do this over a bowl so that you save the juices.

Empty the cherries carefully in a heavy pot, add the sugar and mix carefully. Add the water and mix.

Heat the fruit at medium heat. Once it comes to a boil, you will see foam forming. Remove the foam with a slotted spoon.

Slowly boil until the juice thickens (use the test noted above). About 20 minutes. Add the lemon juice a few minutes before removing from heat.

Remove from heat and let it cool completely.

Store in a jar.