The basic fundamental behind coffee is that only roughly 30% of coffee is water-soluble. Out of this 30%, only about 20% are actually desirable and tastes good. The goal behind every coffee professional is or should be to extract as much of these good and delicious parts of the coffee whilst minimizing the extraction of the undesirable parts of the coffee. Now that we know that we should all...
There are many variations to the espresso. One of the most commonly ordered variation is the Double Ristretto. Traditionally defined as a very strong or concentrated espresso, the ristretto is typically an espresso with a 1:1 Brew Ratio, while double just means a double shot.In our experience however, we have come across 2 different methods or brewing ristrettos; the Three Part Extraction theory and the fixed 1:1 Brew Ratio method.
1:3 Brew Ratios have become increasingly popular over the last few years. Matt Perger of St. Ali in Australia has been championing the idea of higher brew ratios for awhile now, Tim Wendelboe routinely serves 1:3 Brew Ratios for Espressos at his shop, so does Five Elephant, our own home-grown Oriole Coffee and many more. What is the reason behind 1:3 Brew Ratios' increasing popularity and why isn't everyone brewing it?
Tamping is one of the crucial steps to espresso preparation. Many baristas have been taught to tamp evenly with 30 pounds of pressure and to ensure tamping levelness. Today there are also different tampers from flat bases to concave to ribbed surfaces and even different base sizes. This week we set out to test two different aspects of tamping; the levelness of a tamp, the tamper's base size and their effects on the resulting espresso.
Tamping is one of the crucial steps to espresso preparation. Last week, we set out to test two different aspects of tamping; the levelness of a tamp, the tamper's base size and their effects on the resulting espresso. If you haven't already read it, you can check it out below! This time, we are doing a direct comparison between the Levy Tamp and the Pergtamp.
Almost all semi-automatic espresso machines are calibrated and set by default to brew at roughly 9 bars of pressure. Lucky for us, we use the Slayer espresso machine, one of the few espresso machines out there that allows for easy tweaking of the brew pressure. This week, we will be setting out to test the impact of brewing pressure on the resulting espresso and it's extraction percentage.
This week we will take a look at pre-infusion (pre-brew) and it's result in the espresso. Pre-infusion can come in many forms, from soft infusion to hard infusion to variable pressures and different lengths of time. We will be testing multiple pre-infusion techniques over the coming weeks but first, let's define some of the different pre-infusion variables that are commonly used in the coffee industry.
We've tested different brewing pressures, we've tested different pre-infusion timings and pressures; now it's time to put them all together! These days, we pull our espressos with a pre-infusion between 9-16s and full brew pressure at 7 Bars at the shop. Does pre-infusion at this lower brew pressure setting make a difference in extraction percentages? Or will it prove to be equally insignificant as compared to the standard brew pressures?
For the past few decades, temperature stability has been a major goal for many espresso machine manufacturers and also one of the deciding factors of the quality of an espresso machine. There is without a doubt, a huge emphasis placed on temperature in the brewing process of espresso. So how exactly does temperature affect espresso and the brewing process? What is the final impact on the extraction of the coffee when brewed using different temp..