Portafilters guide for espresso fans

What makes the perfect espresso?

Baristas have many tips and tricks for pulling the perfect espresso but, ultimately, how the coffee grounds are held in your espresso machine is at the heart of a delicious shot.

The portafilter, its portafilter basket and the way you press (tamp) the grounds into the basket can make or break your espresso.

Learn how to make an espresso at home

First up, what is a portafilter?

The portafilter (also called a ‘portaholder’) is the device with a handle that your espresso machine pumps water into. The portafilter basket, which holds the coffee grounds, sits inside it. Let's be honest, we've all watched the barista insert the portafilter into the machine with the handle and wished we could have a go.

For perfect espresso extraction, you need to use uniformly ground coffee and evenly press it down into the portafilter basket (called ‘tamping’). To make this critical step as easy as possible to do correctly at home, we’ve given the portafilter on our espresso machines a unique flat base. It has recessed spouts so that you have a stable foundation for pressing down the grounds and achieving a consistently even tamp.

View the espresso machine

Why the tamp is so important

What's all the fuss about tamping? Well, evenly compressed coffee creates resistance, so the water has to work hard to get through. The pressure created pulls the precious oils from the grounds, giving us that intense, authentic espresso taste.

If the grounds are uneven, the water finds the gaps and moves past them, instead of extracting the flavour, leaving a tasteless, watery brew. On the KitchenAid semi automatic espresso machine, the portafilter baskets have an indent that marks the height of an ideal dose after tamping. Easy! No guesswork.

Love crema? Good tamping is also key to getting a lovely tan-coloured froth on top of your shot. See what is crema in coffee?

One or two-shot portafilter baskets

Will you go for one shot or two shots? There are baskets for both. The size of the coffee filter basket you choose depends on which kind of espresso drink you’re in the mood for.

If you’re drinking a pure espresso, you’ll probably opt for one shot.

If you fancy a cappuccino or a latte, they are made with either one or sometimes two shots, topped with steamed milk and milk foam. The flat white is traditionally made with a double shot, so go for a two-shot basket.

Should I choose a double or single wall portafilter basket?

There are two types of filter baskets for KitchenAid espresso machines: double wall (or pressurised) baskets and single wall (unpressurised) baskets. Your choice depends on the level of control you want over the brew process. Here’s how it works:

• Beginner’s choice: Double-wall baskets are pressurised to give more consistent extraction, ideal for beginner baristas. This means that pre-ground coffee, a less precise grind, or a slightly uneven tamp, can still give you good extraction, and a lovely cup of espresso.

• Expert’s choice: Single-wall baskets allow you more control so you can decide on the tamp pressure and so on for fuller-bodied shots. Coffee lovers prefer this type of filter basket, as it allows more control. You can experiment to find the best grind for your machine and beans, to give the fullest flavours and richness. Even if you’re a beginner, give this basket a go. You’ll be a pro in no time.

Why is a portafilter 58mm diameter?

The popular commercial-style portafilter of 58mm diameter is one of the most traditional and enduring elements of espresso making. The reason for having this size rather than a smaller one, is that it retains temperature and distributes heat well during extraction. Designed with recessed spouts, the KitchenAid portafilters have a handy flat base for easier, more stable tamping, to help you to achieve the best flavour and crema. 

How fine should coffee be ground for espresso?

Your chosen coffee should be ground finely for making espresso with a beautiful flavour and texture. KitchenAid espresso machines – both fully and semi auto – have an integrated burr grinder for super-fresh ground coffee bursting with natural flavours. Espresso should be between grind size 55-70 - the consistency of ground cinnamon. You can manually adjust the grind size if the espresso is a little too watery or astringent until the flavour is just right. Enjoy!