1. Fill bottom part of a stovetop espresso pot with water to the pressure-gauge line. Drop in filter basket. Add a heaping tablespoon of espresso for every 3 ounces of water. Screw shut. Cook over medium heat until intense boiling stops and top compartment is full, 3 to 5 minutes.

2. Pour milk into a mug, and microwave to heat through (or heat in pan on stove top).

3. Place a small (4-inch) whisk in hot milk. Holding the handle of the whisk between your palms, rapidly twirl back and forth until foam appears, about 20 seconds. Pour coffee into mug; sweeten if desired.