Stir coffee grinds into a pitcher of cold water using your usual ratio — typically a tablespoon of grounds for every cup of water, but feel free to adjust if you like it stronger.

Let the mixture steep for around 18 hours.

Line a small strainer or colander with a paper coffee filter.

Pour the mixture through the filter. Voilà — cold-brewed coffee! (Serve over ice if preferred.)

Blend banana and milk in blender until creamy.

Pour banana milk mixture over cold coffee, to taste.