An evaporating colloidal particle–laden droplet leaves behind a ring-like residue after drying. We routinely observe this ubiquitous phenomenon for dried coffee drops; thus, it is known as the "coffee ...

Use a cocktail muddler to crack open the cardamom pods. Pour cognac into a quart jar and add muddled cardamom. Rest mixture at room temperature for 1 hour, then use a fine mesh strainer and funnel to ...