Showing posts with label piston. Show all posts
Showing posts with label piston. Show all posts

Monday, October 13, 2008

What is Espresso Coffee?

Espresso coffee is more popular today than it has ever been at any time in its history, perhaps thanks to the marketing power of coffee giants such as Starbucks. Many of the most popular drinks that we consume everyday are made using espresso, rather than the more traditional filter or drip coffee. Drinks such as lattes, cappuccinos, mochas and machiatos.

Given this strong popularity for these espresso drinks, it's surprising that many people don't actually know what an espresso is. For anyone who has never had an espresso, the first taste can be quite shocking. An espresso is very concentrated, and comes in a very small cup. However, it packs a large punch and the flavor can take some getting used to. (In other words, your first impression might be that you just swallowed something vile. But don't worry, it gets better with experience.)

Espresso is made by forcing very hot (not boiling) water through finely ground coffee. The coffee is ground more finely than filter coffee, but is not as finely ground as Turkish coffee, which is more like a fine powder.

Originally, espresso machines used steam pressure to force the water through. Today, a spring piston lever machine is used, which used a piston to generate the pressure and force the water through the coffee. It is important that the temperature does not go too high or low, as this will spoil the beverage. The ideal temperature is 85 to 95 degrees Celsius.

If the water is too hot, the espresso will be too bitter. If it is too cold, it will be too sour. As you can see, making espresso drinks is a very exacting job, and care must be taken to do it right. The people trained to do this are called baristas (which is Italian for barman).

As the water blasts through the coffee, it extracts the flavor, oils, sugars and proteins and dissolves them. This results is a very potent mixture that has a very strong, yet rich and subtle flavor. It also has all the caffeine of a large cup of filter coffee, giving it a strong kick.

To enjoy these drink at its best, it is important to drink the coffee as soon after it is made as possible, definitely within 2 minutes. If you intend to blend it to make espresso drinks, you need to do so within 10 seconds of pulling the espresso.

This is because the flavor packed volatile molecules in the drink rapidly degrade, both through contact with oxygen and as the heat leaves the drink.

The espresso is made up of 3 different parts, the heart, body and the crema, which is the delicate, creamy foam that naturally forms on the top of the drink. The crema is a sign of good espresso, and care should be taken to ensure it is preserved. To do this, some people use pre warmed shot glasses, which prevents heat loss.

There is no such thing as an "espresso roast" - you can make good espresso from light or dark roast beans. A very dark roast is a bad idea, as it can lead to a burnt, charcoal taste. The only important thing is that the coffee is ground to the correct grade, and that the beans are freshly roast.

Selecting the blend is important when making espresso drinks, as it is for any kind of coffee drinks. The factors to concentrate on are sweetness, aromatics and smoothness.

Also, the type of grinder used is important. The best choice is a conical burr grinder. This will produce a consistent grind (the particles will all be the right size), and will also make sure that the coffee does not overheat as it is ground (this would spoil the aroma).

How to make the best espresso drinks could fill books, as there are many factors to balance. This is why coffee shops spend so much time training their staff. When you find a place that serves excellent espresso, recognize that this is not just a happy accident, and recognize the skill and care that goes into making this most demanding drink.

Malcolm Blake has written more information about gourmet coffee at http://www.coffeewebinfo.com. Come and find out more about gourmet coffees .

http://www.coffeewebinfo.com. gourmet coffees

Wednesday, October 1, 2008

espresso makers 101 a guide to espresso makers and machines

As the water is heated, it forces steam up through a tube to the second chamber, then the top, making espresso that is ready to serve. There are three chambers, the top holding the ground coffee, the middle being a filter basket and the bottom holds the water. The first, and most common one to find in homes in Spain, Portugal and Italy, is the stovetop espresso maker. Believe it or not, there are eight different types of espresso makers. Ornate and exquisite, they can be made out of brass, copper, chrome or silver. This type of espresso maker comes in high end designs that can cost several hundreds of dollars. A steam espresso maker is another beast entirely. Before, the crema was thought of as an unwanted waste product. Also, the piston-driven espresso maker is what made the crema a desirable trait in a cup of the drink. The piston-driven espresso machine gave birth to its pump-driven counterpart. Small, simple and ideal for home use, it is also the most popular machine found in American coffee shops. A motor-driven pump does the work that manual force used to, making this version very easy to operate. There are also semi automatic and automatic espresso machines, the former is automatic in the way that the water is delivered from a pump instead of manual force. The latter allows the user to send a programmed amount of water through the flow meter. The antithesis of the Presso manually operated coffee press, these are more expensive but completely fool proof. Fully self contained, all you have to do is fill the water reservoir and bean hopper. From grinding to tamping and extracting, getting a perfect cup of espresso has never been easier. Super automatic espresso machines are even easier to operate, since they literally do all of the work for you.

As the water is heated, it forces steam up through a tube to the second chamber, then the top, making espresso that is ready to serve. There are three chambers, the top holding the ground coffee, the middle being a filter basket and the bottom holds the water. The first, and most common one to find in homes in Spain, Portugal and Italy, is the stovetop espresso maker. Believe it or not, there are eight different types of espresso makers.Ornate and exquisite, they can be made out of brass, copper, chrome or silver. This type of espresso maker comes in high end designs that can cost several hundreds of dollars. A piston-driven espresso maker is another beast entirely. A piston-driven espresso maker is very similar to a stovetop one, and produces a cup of espresso that is nearly identical. A piston-driven espresso maker is very similar to a stovetop one, and produces a cup of espresso that is nearly identical. A steam espresso maker is very similar to a stovetop one, and produces a cup of espresso that is nearly identical.Before, the crema was thought of as an unwanted waste product. Also, the piston-driven espresso maker is what made the crema a desirable trait in a cup of the drink.The antithesis of the Presso manually operated coffee press, these are more expensive but completely fool proof. Fully self contained, all you have to do is fill the water reservoir and bean hopper. From grinding to tamping and extracting, getting a perfect cup of espresso has never been easier. Super automatic espresso machines are even easier to operate, since they literally do all of the work for you.

Sunday, August 24, 2008

what is espresso

It was invented in 1843 by Edward Loysel de Santais and premiered at the Paris Exposition of 1855. The coffee is ground so small, it's almost a powder. It is a concentrated coffee beverage that is brewed by forcing extremely hot water (but not boiling) under very high pressure through finely ground coffee beans. What is espresso? When the spring piston lever that was used in the late 1940s to make espresso is the same one that is used today. That said, it was made with steam pressure until the mid 1940s. People in Milan, Italy perfected espresso in the early 1900s. Furthermore, a standard cup of espresso is just one ounce. Also, there are more dissolved solids in espresso than there are in coffee. For example, espresso is thicker. There are several differences between espresso and coffee. Espresso is a chemically complex fluid and is comprised of three different parts: the body, the heart and the crema. The latter is the most distinguishing characteristic of espresso, and is a reddish brown foam that floats on top of the espresso. Made out of proteins, sugars and vegetable oils, crema has elements of foam colloid and emulsion. Essentially, espresso is a more concentrated form of coffee. The flavors are stronger than coffee because of the finely grated beans and the high pressure used during brewing. Because espresso is so intense and concentrated, it mixes well with other liquids to form different coffee based drinks. It turns out, the question of ìwhat is espresso?î is one that takes a longer amount of time than expected to answer. When mixed with milk, hot water, sugar or chocolate, you can turn espresso into lattes, mochas, cappuccini and macchiati.

It was invented in 1843 by Edward Loysel de Santais and premiered at the Paris Exposition of 1855. The coffee is ground so small, it's almost a powder. It is a concentrated coffee beverage that is brewed by forcing extremely hot water (but not boiling) under very high pressure through finely ground coffee beans. What is espresso?The same type of spring piston lever that was used in the late 1940s to make espresso is the same one that is used today. When the spring piston lever machine was invented, commercial success was huge as it pertained to espresso machines. That said, it was made with steam pressure until the mid 1940s. People in Milan, Italy perfected espresso in the early 1900s.Furthermore, a standard cup of coffee is 8 fluid ounces while a standard cup of espresso is just one ounce. Also, there are more dissolved solids in espresso than there are in coffee. For example, espresso is thicker. There are several differences between espresso and coffee.It turns out, the question of ìwhat is espresso?î is one that takes a longer amount of time than expected to answer. When mixed with milk, hot water, sugar or chocolate, you can turn espresso into lattes, mochas, cappuccini and macchiati.

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