Why Does My Espresso Taste Sour?
(And How to Fix It)
If your espresso tastes sour, sharp or a bit acidic, don’t worry — this is one of the most common things people experience when making coffee at home.
In most cases, sour espresso simply means the coffee is under-extracted. The good news is that it’s usually a straightforward fix once you understand how espresso extraction works and how to dial in your coffee using a simple recipe.
Let’s take a look at what’s happening and how to get things tasting the way they should.
What causes sour espresso?
When espresso brews, different flavours are extracted from the coffee at different stages.
First you get acidity, then sweetness, and finally a little bitterness.
If the espresso shot runs too quickly, the machine mostly extracts the acids, which is why the coffee can taste sour rather than smooth and balanced.
This is what we call under-extraction, and it’s incredibly common when people are learning to use a home espresso machine.
The good news is that it usually just means your coffee needs a few small adjustments.
What is under-extracted espresso?
Under-extraction happens when water passes through the coffee too quickly and doesn’t have enough time to pull out all the flavour from the grounds.
A few signs your espresso might be under-extracted include:
- The coffee tastes sour or lemony
- The espresso feels thin or watery
- The crema looks pale and disappears quickly
- The espresso shot runs very fast and looks like dirty dish water!
If any of this sounds familiar, you’re not alone. Almost every home barista runs into this at some point while learning to dial in their coffee.
What brew ratio should espresso be?
One of the easiest ways to improve your espresso is by using a consistent brew ratio.
Your brew ratio simply refers to the relationship between how much coffee goes into the basket and how much espresso ends up in the cup.
A great starting point for most home setups is a 1:2 brew ratio.
For example:
- 18g of coffee in the basket
- 36g of espresso in the cup
- Extraction time of around 25–30 seconds
If your shot finishes too early — for example 18g in and only 25g out — the sweeter flavours haven’t had time to extract. That’s when espresso often tastes sour or unbalanced.
Using a simple recipe like this makes a huge difference when it comes to consistency.
How do you fix sour espresso?
Most of the time, fixing sour espresso simply comes down to dialling in your coffee properly.
Start with this simple recipe:
Espresso Recipe
- Dose: 18g coffee
- Yield: 36g espresso
- Time: 25–30 seconds
If your shot runs too quickly and tastes sour, try grinding your coffee slightly finer. This slows the flow of water through the coffee and helps extract the sweeter flavours.
Dialling in espresso is really just about making small adjustments until your grind size, brew ratio and shot time are working together.
Once things are dialled in, you’ll usually notice your espresso tastes smoother, sweeter and much more balanced.
Still struggling to dial in your coffee?
Firstly you’re not alone. Lots of home baristas already have great equipment — they just need a bit of help getting everything dialled in properly.
That’s where Mr Barista can help.
We offer in-home barista training across the
- Gold Coast
- Brisbane
- Northern NSW
During a session we help coffee lovers:
- Dial in their espresso grinder
- Improve coffee extraction
- Learn how to texture milk
- Make café-quality coffee at home
If your espresso is tasting sour, bitter or inconsistent, a few small tweaks can make a huge difference.
Get in touch with Mr Barista and we’ll help you dial in your coffee so every cup tastes the way it should.
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