Why Does My Espresso Taste Bitter?
(And How to Fix It)
You’ve pulled a shot, taken a sip… and ouch — it’s bitter. Not just a little sharp, but that “ugh” bitter that ruins your morning. Don’t worry, you’re not alone.
Bitter espresso is one of the most common frustrations for home baristas. The good news? It’s usually something easy to fix with a few tweaks.
What causes bitter espresso?
Bitter espresso happens when too much of the coffee is extracted. During extraction, flavours come out in this order:
- Acids (bright and sharp)
- Sweetness (balanced and full-bodied)
- Bitterness (if extraction goes too long)
If your shot runs too slowly, uses too fine a grind, or has too high a dose, you’re pulling more of the bitter compounds than you want. Other causes can include:
- Water temperature too high
- Over-tamping or compacted coffee
- Shot running too long
All of these can lead to espresso that tastes bitter, harsh, or burnt.
What is over-extracted espresso?
Over-extraction happens when water passes through the coffee too slowly or stays in contact with the grounds for too long, pulling out too many bitter compounds.
A few signs your espresso might be over-extracted include:
- The coffee tastes bitter, harsh, or burnt
- The espresso feels heavy or syrupy
- The crema looks dark, oily, and slow to disappear
- The espresso shot runs very slowly or drips instead of pouring
If any of this sounds familiar, you’re not alone. Almost every home barista encounters over-extraction at some point while learning to dial in their coffee for smooth, balanced espresso.
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 bitter espresso?
Most of the time, fixing bitter espresso simply comes down to dialling in your coffee properly.
Here’s how to rescue your bitter espresso:
Espresso Recipe to Try
- Dose: 18g coffee
- Yield: 36g espresso
- Time: 25–30 seconds
Tips:
- If the shot runs too slowly, try a slightly coarser grind.
- Check your dose — too much coffee can slow extraction and increase bitterness.
- Make sure your tamping pressure is firm but even.
- Use filtered water at around 90–95°C.
Small tweaks make a huge difference. With a little dialling in, you’ll notice your espresso tastes smooth, balanced, and café-quality rather than bitter.
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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