Lungo is Italian for long, and a caffè lungo is an espresso pulled with roughly twice the usual water through the same dose of ground coffee. A standard shot, the normale, takes about 18 to 30 seconds and yields 25 to 30 milliliters, while a lungo can run for up to a full minute and fill the cup with 50 to 70 milliliters. The episode lays out the brewing ratios behind the menu: a ristretto near 1:1, a normale near 1:2, and a lungo stretched to 1:4, with the bean blend, often Arabica and Robusta in traditional Italian espresso, the fineness of the grind, and the machine’s pressure setting the pace.

The key is that coffee’s flavor compounds dissolve at different rates. Pressurized water first strips fruit acids, organic acids, and simple sugars, then, past the 20 to 30 second mark, begins breaking down heavier plant fibers, lipids, and tannins, which gives a lungo a bitterness, smokiness, and depth a normale never reaches. That is why an Americano, espresso topped with hot water, or a long black, espresso pulled into hot water to protect the crema, can never taste like a lungo: their extra water never passes through the coffee grounds under pressure.

• A lungo is not a half strength espresso; it holds a different mix of compounds.
• The episode frames extraction as an orchestra, with acids and sugars as early violins and tannins as late arriving tubas.
• Crema is a layer of emulsified oils and carbon dioxide foam that pouring water over espresso tends to break apart.
• In French speaking Quebec the lungo is the café allongé, a staple of the province’s cafés.
• Tannins and heavy lipids only give way after prolonged battering by high pressure, near boiling water.