Yes! Puree the blueberries, lemon and water in the food processor, then add to a heavy-bottomed saucepan. Heat, stirring often over medium heat until the mixture simmers. Continue cooking, stirring occasionally until the mixture darkens and the blueberries are very saucy and broken down, about 8 minutes. Remove from the heat. If desired, add a non-nutritive sweetener like monk fruit or stevia to taste, and then cool. Puree again, strain and enjoy!