The scale reads exactly 19g, the timer stops at 30 seconds, and precisely 38g of espresso lands in the cup. On paper, the recipe has worked perfectly. But with the first sip, you realize: technically everything is correct, but it's missing something. The espresso might seem a bit dull, a touch too bitter, or lack the promised fruity sweetness.

This is where simply following numbers diverges from true barista craftsmanship. We leave behind the rigid constraints of standard recipes and embark on a quest for the sweet spot.

What is the sweet spot?

In the world of specialty coffee, the sweet spot describes that fleeting moment of perfect balance. Coffee consists of thousands of chemical compounds that are released sequentially during brewing: first the acids, then the sweetness and complex aromas, and finally the bitter, woody notes.

The sweet spot is the precise window in which the extraction has progressed just far enough to emphasize the full sweetness and individual character of the bean, without the unwanted bitterness of over-extraction dominating the taste.

The three phases of extraction

An espresso doesn't extract all the substances at once. It changes during the brewing process:

1. The acid phase (beginning): Fruity, bright, tangy, but extremely sour/salty if underextracted.

2. The sweet phase (middle): Sugar and caramel notes round off the shot.

3. The bitter phase (end): Brings depth and structure, but if over-extracted it becomes dry and unpleasantly woody.

Your goal: To find the balance where the sweetness buffers the acidity and the bitterness serves only as a subtle foundation.

The three most important parameters

The ratio

The ratio determines which extraction phase dominates. Small changes to the target weight (output) often work wonders:

• More sweetness & balance: Slightly increase the output (e.g., from 38 g to 41 g). The water dissolves more sugars from the flour.

• More body and intensity: Reduce the output (e.g., to 34 g). The espresso will become syrupy and stronger, but will tend towards acidity.

The grind

The grind size controls how easily the water can extract the aromas from the coffee grounds:

• Grind finer (longer time): More extraction. Good if the coffee tastes weak or too acidic. Caution: Grind too finely leads to bitterness.

• Grind coarser (shorter brewing time): Less extraction. Good if the coffee tastes too heavy or bitter. Brings more clarity and fruitiness.

The temperature

Temperature is the "finishing touch" for advanced users:

• Higher (94–95 °C): Emphasizes sweetness and extracts more from light roasts.

• Lower temperature (90–92 °C): Reduces bitterness, especially important for dark, classic roasts.

Quick Check: Problem & Solution

Your goal	Adjustment	Effect
More sweetness	Slightly increase the ratio (more output)	The sugar phase is emphasized more strongly.
More fruit/clarity	Grind slightly coarser	Acid becomes more vibrant, less "heavy".
More body	Reduce the ratio (less output)	Higher concentration, oilier mouthfeel.
Less bitterness	Coarser grind size & lower temperature	Less dissolution of heavy bitter substances.
Less acid	finer grind	More extraction masks the sharp acidity.

Pro tip: Pay attention to the preparation.

Not every bean reacts the same way to your fine-tuning. The way the coffee was processed on the farm after harvesting determines its behavior in the portafilter:

• Washed: Delivers clear, transparent profiles. Responds very precisely to grind size changes. Ideal for light, fruity shots.

• Natural (Dry): Brings a lot of sweetness and berry aromas. However, it tends to slow down the flow. Grind it a little coarser here to avoid bitterness.

• Anaerobic / Experimental: These coffees are extremely intense. Here, "less is more" often applies. Slightly lower temperatures (90–92 °C) help to keep the often alcoholic or extremely fruity notes clean.

Your path to the perfect shot (step by step)

1. Draw a reference shot: 19 g → 38 g → approx. 30 sec.

2. Tasting: What bothers you? What are you missing?

3. Change only ONE parameter: Either change the ratio OR the grind size. Never both at the same time, otherwise you'll lose control.

4. Try again: Compare the result with your first shot.

Cheat sheet after roasting & processing

Roasting & Processing	In (g)	Out (g)	Time (sec.)	Grind size	temperature	Taste & Tip
Light Washed	18–19	36–38	28–32	Medium-fine	93–95 °C	Clear, vibrant, clean acidity; finely tuned between fruit and sweetness.
Light Washed – sweet	18–19	40–41	30–32	Medium-fine	93–95 °C	More sugar & balance; slightly increase the ratio
Light Washed – fruitier	18–19	42–43	28–30	Medium	92–94 °C	Fruity notes more pronounced, somewhat lighter body
Light Natural	18–19	38–40	30–34	Medium	92–94 °C	Full body & sweetness; slower flow → pay attention to channeling
Light Natural – fruity	18–19	42–44	28–30	Medium-coarse	91–93 °C	Clearer, more vibrant, not too thick
Honey / Pulped Natural	19	38–40	30	Medium	93–94 °C	Balance of sweetness and fruit, velvety body
Honey – fruity	19	42	28–30	Medium-coarse	93 °C	Lively acidity & clear aromas
Anaerobic & experimental	19	36–38	30	Medium-fine	91–92 °C	Highly complex and sensitive – small adjustments have a significant impact.
Anaerobic – fruity & clear profile	19	40	28–30	Medium	90–92 °C	Greater clarity, highlighting fruity notes
Dark Italian roast	18–19	34–36	28–32	Fine	90–91 °C	Syrup-like, chocolate & depth emphasized
Dark – balanced	18–19	38	30	Medium-fine	90–91 °C	Balance between sweetness & body

Want to take espresso to the next level?

If you want to learn practically, rather than just from tables, rules and experiments, our barista workshops at Kaffeekirsche Roastery are perfect:

• How to Barista – Basic: Fundamentals of espresso preparation, milk frothing, sensory analysis, pulling your own shots, including coffee for home & certificate.

• How to Barista – Advanced: Grinder, brewing recipes, latte art, machine maintenance, sensory analysis, individual exercises & certificate.

Duration: 3–4 hours, small groups (~4 people), practical & intensive – ideal for consciously shaping espresso.
More information & booking at kaffeekirsche.berlin

We look forward to seeing you!