Add the juice, banana, frozen cherries, yogurt, and vanilla to a high-speed blender.: The moment these ingredients meet in the blender you will notice color and scent starting to mingle, a deep cherry hue with a sweet, dairy aroma. I like to layer them with the liquid cherry juice first so the blades can catch the softer banana and vanilla Greek yogurt without binding on frozen fruit. A common mistake is packing the blender too full, which can lead to uneven blending, so leave a little headroom. If your blender struggles, pulse a few times to break up ice pockets rather than running constant high speed right away.
Cover with the lid and blend on low and after that on high speed, until completely smooth.: You will hear a change in the sound as the mixture goes from rumbling chunks to a steady hum, and visually you will see the texture go from icy flecks to glossy, uniform liquid. Starting on low protects the motor and helps everything incorporate gently, then bringing it up to high ensures the frozen dark sweet cherries fully break down. Avoid over blending, which can warm the smoothie and thin the froth; stop as soon as it looks velvety and homogeneous. If it seems too thick, add a tablespoon of chilled cherry juice at a time.
Pour into 2 glasses and serve topped with fresh cherries and mint sprigs.: The final sensory moment is the presentation, the bright color against chilled glass and the fresh scent of mint sprigs . Pour slowly to preserve a slight frothy top, and place a few halved fresh cherries on top for texture contrast. A common oversight is serving in warm glasses, which mutes the chill, so either chill your glasses or serve immediately after blending. If you notice separation after a few minutes, a quick stir restores the texture and aroma.
