Getting the grind size and dose right are two of the most important steps in pulling a delicious espresso shot. Whether you’re a budding home barista or simply keen to understand how to improve your coffee, this guide will walk you through the basics in a warm, approachable way. We’ll explain key concepts, provide practical steps, highlight common mistakes, and offer troubleshooting advice — all tailored for the Australian coffee lover’s kitchen.
Why Grind Size and Dose Matter in Espresso
Espresso is a concentrated coffee extraction where hot water is forced through finely ground coffee under pressure. The grind size and dose (amount of coffee used) directly influence the extraction time, flavour, and balance of your espresso.
Grind size determines how fast water passes through the coffee bed. Too coarse and water rushes through, leading to under-extraction (sour, weak flavours). Too fine and water struggles through, causing over-extraction (bitter, harsh notes).
Dose affects the strength and balance of the shot. Too little coffee results in a weak, watery espresso; too much can cause channeling or excessive pressure, ruining the taste and your machine’s performance.
Getting these right is crucial to consistently brewing a tasty espresso.
Understanding Espresso Grind Size
What is Grind Size?
Grind size refers to how fine or coarse the coffee grounds are. For espresso, the grind is much finer than for other methods like French press or drip. It should feel like fine sand or table salt.
Why Is Espresso Grind So Fine?
Espresso brewing is very fast, around 25-30 seconds, and under high pressure. A fine grind increases the surface area of the coffee, allowing water to extract flavours efficiently in this short time.
How to Adjust Grind Size
- Too fast extraction (under 20 seconds): Grind finer.
- Too slow extraction (over 35 seconds): Grind coarser.
Adjust in small increments and test several shots to find the sweet spot.
Understanding Espresso Dose
What is Dose?
Dose is the amount of ground coffee you put into your portafilter basket. It is usually measured in grams.
How Much Coffee Should You Use?
Traditional espresso recipes use between 18-20 grams for a double shot. This can vary depending on your machine, basket size, and personal taste.
For example, the Velvet Reserve – Decadent Dark Chocolate & Caramel Symphony recommends a dose of 20-21 grams with an extraction volume of 25-30 ml for an ideal shot.
How Dose Affects Extraction
- Higher dose means more coffee, potentially stronger flavour, but can increase resistance and pressure.
- Lower dose means less coffee, lighter body, and faster extraction.
Balancing dose with grind size and tamping pressure is key to a great espresso.
Practical Steps to Dial In Your Espresso
- Start with a dose of 18-20 grams for a double shot.
- Set your grinder to a fine espresso setting.
- Grind your coffee freshly just before brewing.
- Tamp evenly with about 15-20 kg of pressure to create a uniform coffee puck.
- Run your espresso shot and time it.
- Adjust grind finer if the shot pulls too fast (35 seconds).
- Taste the espresso. Aim for balanced sweetness, acidity, and bitterness.
- Fine-tune dose and grind until you reach your desired flavour.
Common Mistakes and How to Avoid Them
- Using stale coffee: Always use fresh coffee for best flavour. Beans like the Heritage Blend – Classic Chocolate & Toffee Harmony are great fresh options.
- Inconsistent grind: Use a quality burr grinder instead of blade grinders for uniform particle size.
- Uneven tamping: Tamp firmly and evenly to avoid water channeling.
- Ignoring extraction time: Extraction time is a key indicator — don’t just rely on taste.
- Not cleaning equipment: Regularly clean your grinder and machine to avoid stale residues.
Troubleshooting Your Espresso Shots
- Shot tastes sour: Grind finer or increase dose to extract more flavours.
- Shot tastes bitter or burnt: Grind coarser or reduce dose to avoid over-extraction.
- Shot is watery or thin: Increase dose and/or grind finer.
- Shot is slow and dripping: Grind coarser or reduce dose.
- Crema is thin or absent: Use fresh coffee, adjust dose, and ensure proper tamping.
Takeaway: Mastering Grind and Dose for Your Best Espresso
Dialling in your espresso grind and dose takes patience and practice, but it’s rewarding. Remember these key points:
- Espresso grind should be fine, like table salt, to allow proper extraction.
- Dose typically ranges from 18-20 grams for a double shot.
- Extraction time between 25-30 seconds is a good target.
- Adjust grind and dose together based on shot timing and taste.
- Use fresh, quality beans and clean equipment for best results.
With these basics mastered, you’ll be on your way to pulling espresso shots that sing. For a delicious espresso experience, pairing your grind and dose knowledge with quality coffee like the Velvet Reserve or Heritage Blend helps bring out rich chocolate, caramel, and toffee notes that Australians love.