Make this delicious filling for our romantic Raisin Heart Pockets.
Combine the raisins, water, sugar, flour, lemon zest, and cinnamon in a small saucepan over medium heat. Bring to a simmer. Cook, stirring frequently, until most of the liquid is absorbed, 3 to 5 minutes. Transfer to a food processor. Process until smooth. Refrigerate filling until cool and thickened slightly, about 1 hour.