2 Tablespoons flour 1 1/2 cups sour cream 1 cinnamon stick 3 Tablespoons lemon juice 1/4 cup sugar 1 cup unsweetened sour or tart cherry juice 1 cup water 2 (1/2-inch) strips lemon zest 24 ounces or 2 jars pitted sour cherries in liquid
Strain liquid from jarred cherries into a saucepan (there should be about 2 1/2 cups liquid), reserving cherries. Add unsweetened sour cherry juice, water, lemon juice, sugar, cinnamon stick, and lemon zest. Bring to boil, reduce heat, and simmer for ten minutes.
While mixture is simmering, combine 1 cup sour cream and flour in a medium-sized bowl with a whisk and reserve. Remove cherry liquid from heat, remove lemon zest and cinnamon, and cool slightly, about three minutes.
Add 1/2 cup of the cooled cherry liquid to the flour mixture and whisk until smooth. Whisk in cooled cherry liquid until combined, add reserved cherries, and simmer for five minutes, or until slightly thickened.
Remove from heat and chill at least two hours. Ladle into bowls and top with additional sour cream, if desired.