Pour 4-5 oz chilled milk into a serving glass and put it in the fridge.
Next, grind 17-18 g of fresh coffee beans to an extra fine consistency.
Gather coffee grounds in a portafilter and tamp it. Reattach the portafilter to the machine.
Take out the chilled glass from the fridge and place it right under the portafilter.
Pull a ristretto-style espresso shot for 17-20 sec directly on top of the cold milk. Do not stir.