WHY IS MY ESPRESSO SO BITTER?

We've all wondered why our espresso sometimes tastes overly bitter. Some even believe that espresso is inherently bitter, while others generalize this bitterness to all types of coffee. However, this is not entirely accurate. While coffee can possess a robust flavor with subtle hints of dark chocolate bitterness, it shouldn't be overwhelmingly bitter. Especially for espresso, the ideal taste profile leans towards smoothness and sweetness rather than bitterness. It's meant to offer a rich, intense flavor that's generally enjoyable to most palates. So, what could be causing your bitter shot? Let's explore a few possibilities.​​

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Dirty Equipment

 

One crucial aspect to consider is the cleanliness and maintenance of your espresso machine and grinder. While daily cleaning isn't necessary, regular upkeep is vital based on your usage. If you're pulling 3-4 shots a day, weekly backflushing with a product like Cafiza is recommended. Additionally, using a brush to clean the shower, maintaining a clean portafilter, and descaling as needed are essential practices. Occasionally, you may need to replace parts like the brew gasket or shower screen. On the grinder side, running a cleaning product like Grindz every couple of months helps maintain cleanliness. Failure to keep equipment clean can lead to stale-tasting coffee, and the buildup of oils and minerals can contribute to bitterness. Proper maintenance extends equipment life and eliminates it as a factor in flavour issues.​​

 

 

Over-Extraction

 

The primary culprit behind bitter espresso shots is over-extraction. Achieving the perfect extraction is a delicate balance between hot water and coffee grounds. Over-extraction occurs when the water bonds excessively with the coffee, often due to poor flow through the espresso puck. This can happen if the grounds are too fine or if the tamp pressure is too tight. Additionally, overheated water can scorch the coffee, leading to bitterness. Ensuring a proper tamp pressure and water temperature is essential to avoid over-extraction. Adjusting grinder settings to a slightly coarser level can also help mitigate bitterness.​

 

 

How to Fix Bitter Shots

 

To address bitterness, start by controlling variables within your control. Ensure your espresso machine's water temperature is set correctly, typically around 93 degrees Celsius. Proper tamping technique is crucial; consider using a calibrated tamper for accuracy. Check your grinder settings and make minor adjustments if shots are consistently bitter. Aim for a shot time of 20-30 seconds, as shots taking longer are likely to be bitter. Experiment with different settings when changing beans, as each variety may require adjustments for optimal results. With practice, you'll develop a better understanding of how to achieve the perfect shot.​​