The Art of Coffee: A Melbourne Barista Explains Espresso Basics

 Espresso is a small, concentrated coffee made by forcing hot water, at roughly 90–96°C, through finely ground coffee under about 9 bars of pressure. A well-made shot takes around 25–30 seconds. It is the base for almost every café drink you’ll order in Melbourne, including flat whites, lattes, cappuccinos and long blacks.

What separates a good espresso from a poor one is control over five things: dose, grind, yield, time and freshness. Once you know how they fit together, you can taste the difference in your cup and order with confidence.

What exactly is espresso?

Espresso is a brewing method, not a type of bean. Any coffee can be brewed as espresso if it is ground finely and extracted under pressure.

The result is a short, syrupy shot topped with crema, the reddish-brown foam formed when pressure emulsifies the coffee’s oils with dissolved gas. Crema is a good sign of freshness, but it isn’t a guarantee of flavour.

What are the five variables behind every shot?

A barista adjusts five things, and a change to one affects the others.

Variable	What it means	What changes if it’s off
Dose	Weight of ground coffee in the basket	Too little tastes thin; too much can choke the machine
Grind	How fine the coffee is	Too coarse runs fast and sour; too fine runs slow and bitter
Yield	Weight of liquid coffee in the cup	Affects strength and sweetness
Time	How long the shot runs	A guide to whether extraction is balanced
Freshness	Days since the beans were roasted	Stale beans taste flat and produce little crema

What does a standard double shot look like?

A common starting point is a 1:2 ratio, for example 18 grams of ground coffee producing about 36 grams of espresso in 25–30 seconds. Roasters and cafes vary this, with darker roasts often pulled slightly longer and lighter roasts slightly shorter.

Treat these numbers as a starting recipe, not a rule. Baristas adjust the grind through the day as humidity, temperature and the beans themselves change.

Why does my espresso taste sour or bitter?

Sour usually means under-extraction, and bitter usually means over-extraction. Under-extracted coffee hasn’t pulled out enough of the sweet, balanced compounds, so acidity dominates. Over-extracted coffee has pulled out too much, leaving a harsh, dry finish.

The fix is typically a grind adjustment: slightly finer for sour, slightly coarser for bitter. If you’re making espresso at home, change one variable at a time so you know what caused the difference.

How do the common Melbourne coffee orders differ?

The espresso is the same, and the difference is the milk, the volume and the cup.

Drink	What’s in it	Taste and texture
Short black	Single or double espresso	Strong, concentrated
Long black	Espresso poured over hot water	Smoother, longer, keeps the crema
Flat white	Espresso with thin, velvety steamed milk	Coffee-forward, silky
Latte	Espresso with more steamed milk, thin foam	Milder, creamier
Cappuccino	Espresso with steamed milk and thicker foam	Light and airy
Piccolo	Ristretto or espresso with a little milk in a small glass	Strong but softened
Magic	Typically a ristretto-based double with steamed milk in a small cup	A Melbourne favourite, between a flat white and a piccolo

Café menus use these names slightly differently, so if you want a specific size or strength, just ask your barista.

How fresh should coffee beans be?

Beans taste best within a few weeks of the roast date. Many roasters suggest using beans somewhere between about one and six weeks after roasting, and this is a general guide rather than a fixed rule. Look for a roast date on the bag rather than a “best before” date alone.

Store beans in an airtight container away from heat and light, and grind just before brewing. Pre-ground coffee loses aroma quickly.

How can you tell if a cafe takes espresso seriously?

Look for a few simple signs:

• The barista cleans the portafilter and wipes the steam wand between drinks.

• The menu names the roaster or blend. [VERIFY: Rocksalt’s roaster or blend before naming it.]

• Milk is textured smoothly, with no large bubbles and no scalding.

• Your drink arrives promptly, since espresso is best within minutes of being made.

A good cafe will also happily adjust a drink for you, whether that’s stronger, hotter or with alternative milk.

How can you enjoy better coffee at Rocksalt in Brighton?

If you’re at a café on Bay Street, start with a flat white or long black, which show off the espresso best, and ask the barista what’s pouring well that day. Pair it with something from the seasonal menu and the coffee becomes part of the meal rather than an add-on. Planning a visit? Book a table at Rocksalt, or drop in and ask the team to recommend a coffee to match your meal. 

4. FAQ Section

1. What is the difference between espresso and regular coffee?
Espresso is made under pressure with finely ground coffee, producing a small, concentrated shot. Filter coffee is brewed more slowly with coarser grounds and gravity, producing a larger, lighter cup.

2. How much caffeine is in a shot of espresso?
A single shot generally has less caffeine than a large cup of filter coffee, because the volume is much smaller. Exact amounts vary by bean and recipe, so check Food Standards Australia New Zealand (FSANZ) for official caffeine guidance. [VERIFY the current FSANZ wording before quoting figures.]

3. What’s the difference between a flat white and a latte?
A flat white has thinner, silkier milk and a stronger coffee taste. A latte has more milk and a milder taste, often served in a larger glass.

4. What is a ristretto?
A ristretto is a shorter, more concentrated espresso that uses less water. It tends to taste sweeter and heavier.

5. Why is my espresso at home weak?
Common causes are too coarse a grind, too little coffee, or stale beans. Try grinding finer first.

6. What is a “magic” coffee in Melbourne?
It’s a local order, usually a double ristretto with steamed milk served in a small cup. Not every cafe offers it, so ask first.