Once a food is processed, it begins to deteriorate immediately with exposure to oxygen. Foods that are high in fat or oil content are especially susceptible to this degradation, as their oils will begin to break down and become rancid in relatively short order. Flushing the package with nitrogen forces out the majority of oxygen and, unlike vacuum-sealing, also provides a bit of packaging protection as well. Nitrogen-flushing is often used with more delicate foods (like potato chips!), but is also very popular in preserving coffee beans.

According to a few different roasters over on coffeed.com, coffee preservation experiments revealed that while packaging the coffee directly after roast did result in the out-gassed CO2 expelling oxygen through the one-way valve, their nitrogen-flushed counterparts lasted longer. In fact, one roaster reported that the shots pulled with a bag roasted 24 days previously still held up well! A major drawback, however, is that the nitrogen flushing process is not considered to be an organic-friendly practice, so roasters that are certified organic cannot employ this technique.

Whether or not you’re cool with this preservation process is sort of personal preference, but it’s something that a lot of large scale roasters practice — even some of the renowned third wave roasters, like Europe’s Coffee Collective. And while the coffee will stay fresher using this method, once the bag is opened, it will age just as rapidly as any other variety … so use it or lose it.

We asked Gail to pull shots from the Izzo Alex Duetto II, La Spaziale Mini Vivaldi and Breville Dual Boiler so that we could see how they compare. No science at work here, friends (hey, old habits die hard!), but we did use the same grinder for each machine (the Nuova Simonelli MCI), coffee (Lavazza Super Crema) and brew temp (199F) to try to nail down a few of the variables.

Watch as we taste and discuss the shots from each of these machines, then rank them in terms of our favorites, flavor-wise.

If you’re interested in learning about the different methods used to decaffeinate coffee, you can check out this article we wrote a couple of years ago.

Watch as Gail brews several shots at different temperatures, tasting each to determine the ideal brew temp for Super Crema.

Watch as she cups Lavazza In Blu, Qualita Oro, Qualita Rossa, Bar and Crema e Gusto.

We’re big on freshly grinding your coffee before each shot, as pre-ground starts to dry out (even in air-tight containers) within the first 24 hours. To show you how the shots degrade, we dialed in and ground a bunch of coffee, then pulled a shot the day of for baseline purposes. We then pulled shots 24, 48, 72 hours and 1 full week later to show how the shots measured up — and to give our unequivocal vocal and facial feature responses to their flavor. Yowza!

Watch Gail as we go through the initial testing and then check in throughout the subsequent week.

1. To ineffectively swat at flies, yet one day you accidentally killed one and couldn’t bear to keep the gut-stained book around.
2. To prop up the uneven handmade bookshelf lovingly made by a friend/parent/spouse/sibling/child that never sits right on the wood floor.
3. To start a fire in the fireplace to enjoy while sipping on a delicious glass of chai spiced wine. (Guilty!)

Or, maybe you just recycled it by accident. Whatever the case, the fact of the matter is that now you have no wisdom to guide you. We created our manufacturer manual repository over at Brown Bean to connect you with the source code. We have manuals for a lot of models both current and historical, so if you’re looking for tips on how to perform maintenance or need to find out what that error code means, check ‘em out.

Don’t see your model there? Leave a comment here and we’ll see if we can’t track it down and add it to the repository.

• Manual/Lever: With these machines, you are the pump. You grind, tamp and control the pressure during the extraction. You also manage the whole steaming process.
• Semi-Automatic: Semi-automatics have 15 – 17 BAR pumps involved, which will settle down to about 9 BARs of pressure if your grind/tamp is accurate. You will grind & tamp, then initiate the shot on and off. Steaming is also up to you.
• Automatic: Still grinding, tamping and steaming on your own, but you can program these machines to dose out a specific amount of water, so it will automatically end the shot.
• Pressurized Portafilters: Automatic and semi-automatic machines can have a variation that includes a pressurized porftafilter. This makes the machine a little bit easier to use because you don’t have to be super particular about your grind and tamp.
• Pod-Friendly: Another variation of semi-automatic and automatic machines are those that allow you to use what is basically a ground coffee version of a tea bag. These single serving pods make for easy, mess-free brewing.
• Superautomatic: These machines manage the whole grind and tamp process for you, but on most of them you will still be required to steam your milk. Some of them (usually called ‘One Touch’) provide automated frothing and shot extraction into your cup at the touch of the button; others have an automated frothing system that will froth the milk separately and you can pour it into the cup after it’s automatically extracted.
• Capsule: Probably the most simple machine in terms of materials and labor, these guys use a proprietary capsule filled with pre-ground coffee and extract it at the touch of a button — no grinding and tamping. Some of them have automatic frothing options.

We asked Gail to talk to us about these different machines, why someone would want to buy a specific type and why perhaps they wouldn’t want to buy it. Hopefully, this video will function as a good primer for learning the basic functional differences and help you as you research which machine best suits your needs.