What Is an Espresso Recipe?

As a home barista, there’s nothing more frustrating than buying a quality bag of coffee, getting it home and pulling a shot that just doesn’t taste right.

If it’s sour, thin, or bitter, the problem is usually somewhere in the coffee recipe. But many home baristas don’t actually record the recipe they’re using, which makes troubleshooting that much harder.

An espresso recipe is built around four key variables: dose, yield, extraction time and grind size. Together, these components tell you:

• How much coffee you started with
• How much espresso ended up in the cup
• How long the shot took to get there
• How fine/course it was ground

When you brew with intention, you won’t have to guess why one shot tastes good and the next doesn’t. Learn how to diagnose a bad shot with Bold Street Coffee’s guide to espresso recipes.

1. Dose

The dose is the amount of dry, ground coffee you put into your portafilter basket.

A key point to remember about dosing for home espresso is that the more coffee you start with, the more work you have to do to extract it. While massive doses have become popular in recent years, they aren’t inherently better.

A classic Italian espresso machine, for instance, is usually built for a 14 to 15-gram dose.

Your ideal dose will partly depend on your espresso machine and the size of its portafilter basket. Before you start, it’s worth checking the manufacturer’s recommendation.

For a home setup, like a Sage Barista Pro using an 18g single-wall, non-pressurised basket, we’d recommend starting with around 18g of coffee and adjusting from there.

The goal is to use a dose that suits your basket and gives the water enough room to flow evenly through the puck (rather than just adding more coffee).

If you try to force a higher dose, the equipment will struggle to disperse water and maintain the temperature required to do the work.

Higher-quality equipment lets us push larger doses because its uniform grinding and stable componentry make the work easier. When deciding on your dose, you must account for the coffee itself:

• Darker roasts: These are more soluble. It takes less work to extract the flavours, meaning you can generally get away with a higher dose.
• Lighter roasts: These require you to work incredibly hard to extract the solubles. If you start with a massive dose of a light roast, you give yourself an impossible amount of work. The result will be inevitably sour, harsh, under-extracted, and thin-bodied. Lower your dose to save your taste buds.
• Density and altitude: Lower-grown coffees are easier to extract. High-elevation, dense, washed coffees are harder to extract and demand a more conservative dose.

(Note: Caffeine is highly water-soluble. A bigger dose of ground coffee directly equals a bigger dose of caffeine in the cup. If you enjoy multiple espressos a day, keeping your dose moderate is a smart move.)

2. Yield

A coffee ratio correlates the weight of the ground coffee (the dose) to the weight of the liquid in the cup (the yield). For example, a 1:2 ratio means 18 grams of ground coffee yield 36 grams of liquid espresso. Notice that we use weight, not volume.

Measuring espresso in millilitres is essentially pointless because of crema. Crema is CO₂ generated during the roasting process that gets trapped as foam. The fresher the coffee, the more gas it contains, and the thicker the foam.

Water acts as your solvent. It pulls the soluble material out of the coffee, and because of this, your yield acts like a slider that changes two things at once:

• Higher yield: Allowing more water to pass through the puck generally extracts more from the coffee, but it also dilutes the espresso. Push the yield too far, and the flavours can become less concentrated, while continued extraction may introduce bitterness.
• Lower yield: Pushing less water through decreases extraction but increases the concentration of coffee flavour and body.

3. Extraction time

Brew time is the total duration of the brewing process, from the moment you press start to the moment you press stop. For those just getting into espresso, 25 to 30 seconds is a great baseline rule.

However, you don’t directly control time; it’s a byproduct of resistance. A commercial espresso machine pushes water at a consistent, repeatable pressure, let’s say a flat nine bars.

The time it takes for a fixed amount of water to pass through the coffee puck tells you exactly how much resistance that nine bars of pressure met. You dictate this resistance using two factors:

• Dose: More coffee adds more physical resistance; less coffee removes it.
• Grind size: The finer you grind, the better the coffee particles fit together – this minimises the microscopic gaps between them and makes it much harder for water to flow through.

4. Grind size

Grind size is one of the easiest variables to change when dialling in espresso because it directly affects how quickly water can move through the coffee puck.

As a general rule, grinding finer slows the shot down and increases extraction. Grinding coarser speeds the shot up and reduces extraction.

If your espresso runs very quickly (for example, in under 20 seconds) and tastes sour or thin, try grinding slightly finer – this adds resistance and gives the water more opportunity to extract flavour from the coffee.

On the other hand, if your espresso takes more than around 35 seconds and comes out bitter or harsh, the grind may be too fine. Coarsening it slightly should bring the extraction back into balance.

Stop guessing and start brewing with Bold Street Coffee

Don’t leave your morning cup to chance. Track your parameters, take the time to understand how water interacts with the coffee puck, and you have the tools you need to troubleshoot an espresso shot like a professional.

All that’s left is to put theory into practice – explore our range of signature Bold Street Coffees and find a bag to dial in at home. We have routine-friendly house espressos, fruity filter roasts, and delicious decaf options – everything you need for a home setup.

Worried about running out? The easiest way to stay stocked up is with our coffee subscription. Just choose your profile (Espresso, Filter, Decaf, or House) and manage your deliveries through the guest portal. Pause, skip, or cancel whenever you need.