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 preferred.
02 - Extract one shot of espresso using an espresso machine or brew 1/4 cup of strong coffee using your preferred method.
03 - Heat and froth the milk using a steam wand, milk frother, or by heating in a saucepan and whisking vigorously until hot and foamy with microfoam bubbles.
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 base, using a spoon to hold back the foam initially. Gently spoon the reserved foam on top of the drink.
06 - Top with whipped cream if desired. Drizzle additional cherry syrup over the foam and garnish with a fresh or maraschino cherry. Serve immediately while hot.