Step 1: Prepare the peach syrup. In a small saucepan, combine diced peaches, sugar, and water. Bring to a simmer over medium heat, stirring until sugar dissolves. Reduce heat and let it gently simmer for 10-15 minutes, until peaches are very soft and the syrup has thickened slightly.
Step 2: Mash or blend the peaches. Remove the saucepan from heat. Use a fork or potato masher to gently mash the peaches, or for a smoother syrup, blend with an immersion blender. Strain the syrup through a fine-mesh sieve into a clean jar, pressing on the solids to extract all liquid. Discard solids. Stir in vanilla extract if using. Let the syrup cool completely, then chill in the refrigerator.
Step 3: Prepare your glasses. Fill two tall glasses generously with ice cubes. This is crucial for achieving the beautiful gradient effect for your Gradient Peach-Infused Iced Latte.
Step 4: Assemble the Gradient Peach-Infused Iced Latte. Divide the chilled peach syrup evenly between the two glasses, pouring it over the ice.
Step 5: Add milk. Slowly pour 1/2 cup of your chosen milk into each glass, allowing it to layer over the peach syrup. Pouring slowly over an ice cube can help maintain the distinct layers.
Step 6: Add espresso. Gently pour 2 shots of chilled espresso into each glass. Again, pouring slowly over an ice cube or the back of a spoon will help the espresso float on top, creating that stunning Gradient Peach-Infused Iced Latte visual.
Step 7: Garnish and serve. Garnish with fresh peach slices or a sprig of mint, if desired. Serve immediately and enjoy your beautiful Gradient Peach-Infused Iced Latte!