You've watched baristas pull perfect shots hundreds of times—it looks easy enough. So why does your morning espresso turn out watery and crema-less one day, then over-extracted and bitter the next? Surely a $6,000 La Marzocco can't be the only thing standing between you and café-quality espresso. Yes, spending eight hours daily on a commercial machine gives professional baristas an edge. But if you're just trying to make a decent Americano at home with whatever machine fits your counter and budget, there are still ways to dramatically improve your results. Read more: I Tried a $140 Espresso Machine That Pulls Creamy Shots and Is Slimmer Than a Blender Kaleena Teoh, co-founder and director of education for Coffee Project New York, talks us through all the steps of pulling shots so that you can brew espresso at home like a professional. Don't miss any of our unbiased tech content and lab-based reviews. Add CNET as a preferred Google source on Chrome. Espresso basics Espresso is a precise brewing method, not a drink. Pamela Vachon/CNET "The word 'espresso' itself is not just a drink, it's actually a brewing method that involves pushing hot water through a compacted puck of coffee," Teoh explains, which can be accomplished through a machine with a boiler, or manually, as in a stovetop espresso pot. It necessitates a particular pressure and temperature calibration, but a high-end machine isn't required. "The two most important things are the machine's ability to maintain pressure and temperature as you pull the shot," she says. In most models for home use, you may not be able to make any adjustments, but gauges or displays that indicate pressure and temperature can be reassuring. Ensure you're closely following the process outlined by the manufacturer, which may involve a step to preheat the water before brewing. Ensuring that your espresso machine is clean, by regularly brushing grounds from the portafilter loading point and periodically flushing with hot water, is also essential for quality control. 1. Grind size matters more than you think Finely ground coffee beans is key for proper espresso. Pamel Vachon/CNET Because espresso is a process, not a drink, there's really no such thing as espresso beans, and you can choose a provenance and a roast that suits you for espresso, even a light one. The grind of any beans you choose significantly affects the outcome of the shot you pull. "The grind size should be around the range of fine sand," says Teoh, which is smaller than that which is used for drip coffee, French press, or pour-over, but not as fine as the powder that would be used for unfiltered brews such as Turkish coffee. This element makes it all the more important to have a grinder that allows you to fine-tune the grind size with a dial, rather than just a few predetermined settings, which may not provide the nuance you need. Teoh also naturally recommends the freshest coffee beans for the best espresso. Grinding to order is great, but you're also looking for beans that have been as recently roasted as possible, ideally within a matter of weeks. More so than the coffee machine itself, Teoh recommends another crucial piece of equipment for the best home-brewed espresso. "If you have a basic machine that can maintain pressure and temperature, that's good enough, but if I have extra budget, I would spend it on a grinder," Teoh says. "Having a good grinder, especially a good burr grinder, is very, very important for espresso." 2. Nailing the coffee-to-water ratio Just like drop coffee, espresso has its own golden ratio. Pamela Vachon/CNET The "golden ratio" is different for espresso than for drip coffee, fresh press, or pour-over since you generally don't have much control over the amount of water that goes into the brew. Instead, you're looking for a specific ratio between the amount of grounds and the amount of liquid coffee that comes out at the end, and yes, professional baristas weigh finished espresso to ensure quality. "The coffee to water ratio is between 1 to 1.5 and 1 to 2.5, meaning that, for every one gram of ground coffee we put in there, we want to yield between one-and-a-half to two-and-a-half grams of liquid espresso in the cup," Teoh says. "That ratio usually gives you a pretty good, what we call 'strength.' It wouldn't be too intense. It also wouldn't be too watery." For the sake of easy calculations while you're experimenting with these ratios, 1:2 is an average range to aim for. The smaller the ratio between grounds and liquid espresso, the stronger the coffee. Despite what marketing language would have you believe, there's no difference between coffee and espresso beans. Basak Gurbuz Derman/Getty Images If your espresso machine has controls that allow you to adjust the strength of your coffee, you can experiment with those. If not, other factors that you can control, which can affect the outcome in terms of the ideal ratio, are the grind size, consistency, and pressure of the puck. 3. Properly preparing the puck Use your finger to gently level the grinds. Pamel Vachon/CNET After measuring your grounds into the portafilter, according to its size and the manufacturer's recommended measurement for a single or double shot, the next step is to level it before tamping. "Use your fingers to ensure that it is distributed evenly before you tamp down," Teoh suggests, so you don't end up with an uneven puck. She explains that water will always look for the path of least resistance between the tank and your cup, so if there's an area in the portafilter that contains a smaller or less pressurized volume of grounds because it was uneven to begin with, that's where the water is going to primarily go, resulting in an improper extraction. A heavy, high-quality tamp should be applied, which is the correct size for your portafilter. Portafilters come in various sizes, typically 51 or 54 millimeters in diameter for home espresso machines. You'll want to upgrade if your machine didn't include a tamper or went with a lightweight, plastic one. Your puck should be level and smooth before pulling a shot. Pamela Vachon/CNET Tamping the puck doesn't involve applying extreme force, but "you will want to push down to a point where you feel like it's pushing back," Teoh says. "You're not using your whole body weight on it, but it's also not like stamping a card. You want to push down and create a dense, tightly packed puck." If you want to be precise about pressure, some guidance suggests applying between 20 and 30 pounds. Teoh also notes that spring-loaded tampers are available, making it easier and more consistent to apply adequate pressure. What about the crema? Crema is less about flavor and more about mouthfeel. Pamela Vachon/CNET The crema, or foam layer on top of your shot, may be desirable. Still, it isn't necessarily an indicator of a correctly pulled shot, nor does it significantly affect the flavor. Teoh explains that carbon dioxide is trapped in the coffee beans during roasting, which is released during brewing and creates the foamy crema. However, it isn't the density of the puck that determines whether it appears during brewing. "Your crema is not just CO2, but it's also oils and insoluble matter in coffee," Teoh says. "There are a lot of aromatic compounds in there, but the actual flavor of your coffee lies in the darker liquid at the bottom. The crema doesn't really carry a lot of flavor, per se, but it does help with mouthfeel." The absence of crema may have less to do with the mechanics of the shot and more to do with the roast itself. "The freshness of the coffee makes a difference," Teoh says, "and some coffee, if it's roasted really lightly, will also not have a lot of crema." To maximize your crema potential, you're looking more for beans of a darker roast that have been recently roasted. Taste and adjust The golden ratio is a good place to start, but don't be afraid to adjust if the flavor doesn't suit your taste. Pamela Vachon/CNET It's your espresso, so it's your palate that matters most for the outcome. Slight variations in the freshness and roast of the coffee, grind size, measurement of the grounds, tamping pressure and consistency, and temperature -- to the degree that you can control it -- will all affect different outcomes. Experiment with the above adjustments for a balanced brew with a nice mouthfeel and length to its flavor until it suits you. "You might not be experienced making espresso, but you're experienced as a consumer," Teoh says, "so you know what you should be tasting in your cup, and if it's not right for you, then you know that something needs adjustment." Given all of the possible variables above, hopefully it's just a matter of tweaking small things, rather than needing a whole new system.