Prepare the cherries by removing the pits (cherry stones)
In a medium saucepan, mix the cherries with water, sugar and lemon juice.
Bring to a boil and then carry on simmering on medium heat, stirring so that the cherries won't burn. After about 20 minutes the cherries should soften and start to disintegrate.
Add the glucose and stir in until dissolved.
Remove from the heat and let cool down a bit.
Using a hand blender or a mixer, blend the cherry mixture until it's pefectly smooth.
Taste and add more lemon juice or sugar if needed. If adding sugar, make sure it dissolves properly before continuing to the next step.
Put the cherry mixture through a sieve and using a spoon get as much of the cherry mixture through as possible.
Pour the cherry mixture into a suitable bowl ( or a container) with a lid and place in a freezer for 30-45 min (innitially)
When the sides of the cherry sorbet start to set (freeze) take it from the freezer and using a hand held whisk, whisk the mixture for few minutes. Fluff up and scrape down with a spatula and place in the freezer for the next 30 minutes.
Repeat the process 3-4 times. The intervals might get slightly shorter, depending on your freezer.
When the whole mixture is nearly set and nice and smooth from the whisking, place it in a freezer suitable container and leave in the freezer until you want to serve it.