Use your espresso machine to make espresso. Alternatively, use instant espresso powder.

Into the glass of hot espresso, add maple syrup, butter, and a small pinch of salt.

Whisk or froth the mixture vigorously for about 15-20 seconds. The butter should completely melt and become incorporated into the coffee, creating a glossy, lightly foamed mixture.

Fill a tall glass generously with ice, then pour in cold milk.

Slowly pour the warm espresso mixture over the milk and ice. Stir gently, taste and adjust the maple or salt if needed.