01 - Combine cherry preserves, water, and lemon juice in a small saucepan. Heat over low heat, stirring constantly until smooth and syrupy, approximately 2 minutes. Strain through a fine-mesh sieve if a smoother texture is desired.
02 - Brew one shot of espresso using an espresso machine, or prepare 1/4 cup of strong brewed coffee using your preferred method.
03 - Heat milk in a small saucepan or using a steam wand until hot but not boiling. Froth the milk using a milk frother or steam wand until creamy and foamy with microbubbles.
04 - Add the prepared cherry syrup and vanilla extract to a large mug. Pour the hot espresso over the syrup mixture and stir thoroughly to combine flavors.
05 - Pour the steamed milk over the espresso-cherry mixture, using a spoon to hold back the foam. Gently spoon the reserved foam on top of the latte.
06 - Top with whipped cream if desired. Drizzle with additional cherry syrup and garnish with a fresh or maraschino cherry. Serve immediately while hot.