Showing posts with label coffee. Show all posts
Showing posts with label coffee. Show all posts

Friday, August 9, 2024

Home Coffee Roasting 緑コーヒー豆の自家焙煎

I do not remember when I started home roasting green coffee beans but it was sometime ago. I started with  an electric popcorn popper, then over time used 4-5 different hot air roasters (many broke, some were discontinued. Only one hot air roaster is still working but I am not using it any longer). I also had a drum  roaster (Behmor 1600) on which I upgraded the control panel and it is still working but is a bit unreliable.  I am currently using a “Gene Cafe” roaster (picture #1).  I am not sure this should be classified as a drum or hot air roaster. It is probably more along the line of the hot air roaster.

General summary: Most roasters are too loud to hear the both the first and second cracks which are important determinants of the stage of roasting the beans have achieved. The roasters also produce a lot of smoke so they have to be used outside or in very well ventilated spaces. Over time, however,  I have discovered that the shape of some of the roasters make it possible to temporarily attach a drier vent duct to the roaster to channel the smoke directly up to the vent hood over the stove. With this temporary set-up the roaster can be used indoors under the hood. All the roasters, especially hot air roasters, are quite sensitive to ambient temperature as well as the voltage fluctuation. Some models have, although limited, programable temperature profiles. For some roasters the amount of green beans you can roast is also limited.

1. Hot air roasters: This type is easy to use but you cannot hear the first or second cracks to judge the roasting stages due to the loud noise made by the machine.

2. Drum roaster: Behmor 1600 (the current model is 2000AB plus) is the only drum roaster I have used. This is composed of a wire mesh drum and a radiant heat source in the back of the drum. This is a very quiet machine and I could hear both first and second cracks. There are some roasting programs you can choose or you could use your  own temperature profile. This worked well but their “smoke suppression system” does not really work and there was no way to attach a drier duct for venting so I could only use this machine outside. In addition the chaff collector is not very convenient and, in general, cleaning is not easy. The capacity is unusually large and it can roast up to 1 pound. The newer model appears to have more controls and other improvements. Over time and with much use the machine became unreliable. The drum would stop turning in the middle of roasting. I would have to shut off the machine and then restart it. As a result I would lose control of the timing of the roast and the beans would come out over or under roasted.

3. Current roaster: Gene Cafe, It has an off-axis glass cylinder drum and you can clearly see the beans while roasting (picture #1) . The chaff collector is large and quite good and allows the attachment of the clothes drier duct and can be used in-doors under the hood. When used outside without the noise of an exhaust fan under the hood I can hear the first crack very well but the second crack is difficult to hear. When used in-doors with an exhaust fan going, I cannot hear either of the cracks. It can roast up to 8oz of coffee in one batch. I am reasonably satisfied with this roaster but cooling takes a long time and chaff removal is not perfect.



To compensate these two short comings, recently, I added another coffee roasting contraption which is the “coffee cooling tray” (picture #2). This is rather simple device but works well. The fan and motor are located at the bottom layer sucking air from top and out. The top sieve has a coarse metal screen where the hot coffee beans get placed (#3) and the middle sieve has a fine metal screen to catch the chaff (#4).



A tiny metal “shovel” is included for stirring (#3).




While cooling, stirring the beans further removes the chaff which is collected in the second sieve (#4).



The hot coffee beans cool down very quickly and quite more chaff comes off. One of the major difficulties is that the Gene Cafe is not designed to be used with an external cooler. After it goes into the cool down cycle, the temperature has to come down below a certain level (I have not determined the exact temp) before you can stop and remove the cylinder/drum which defeats having the external cooling tray. The only way you can remove the cylinder while it is hot is to force it off (by unplugging the machine), removing  the cylinder and dumping the hot coffee beans into the cooling tray. This may not be good for the roaster, however. So, this is what I came up with.

1. I line up an extra roasting cylinder and the cooling tray turned on next to the roaster.

2. After the roasting is completed, I put the roaster into the cooling cycle. Wait about 1 minute until the temperature comes down below 400F then unplug the machine (making sure the cylinder position allows me to remove the cylinder when it stops). 

3. I remove the cylinder and dump the hot coffee beans into the cooling tray and place the spare cylinder back into the roaster(You could put back the original cylinder after dumping the beans but this is difficult since the cylinder is hot and seemingly expands enough to make putting it back more difficult.)

4. Plug the roaster back in and turned it on.  Start “roasting” and immediately turn it to the cooling cycle and let it cool down until it stops. (I am hoping this procedure is the least harmful for the roaster).

So, is all this effort worth it? Although I think I know what I like in my coffee/expresso drinks, I am not sure I can differentiate beans cooled quickly vs slowly in the roaster cooling cycle.  Other factors such as beans, roasting level, grind, how the espresso is brewed may make more significant differences. Never-the-less, I try to do everything in the right and consistent way so that I can have coffee we like.

Tuesday, May 5, 2020

Prune and coffee muffin プルーンとコーヒーマフィン

This is my wife's binge baking again as she is making her way through the quick bread muffin section of the  "Pastries from La Brea Bakery" during the Covid-19 induced yeast shortage. It has rum-soaked prunes and ground coffee which give really nice flavor. As you can see in the picture below the muffin has a nice oversized top.


Shown below is what happened to the "runt" muffin my wife always makes specifically for me, so I will leave the others alone when I can't resist a taste. This one had barely stopped steaming before I busted into it. See the inside with lots of rum-soaked prunes.


Ingredients:
1/2 cup rum (original recipe calls for brandy)
20 soft prunes chopped up
2 1/2 cups flour
3/4 cup granulated sugar
2 tsp baking powder
1 tsp baking soda
4 tbs. finely ground coffee* (might recommend an extra tbs would further add to the coffee flavor in       the final muffin)
2 sticks (8 0z.) butting cut into cubes and frozen
1 1/2 cup plain yogurt
2 large eggs
1 tbs. vanilla extract

*This happened to be home roasted coffee beans to FullCity plus for our espresso.

Directions:
Put the prunes and rum in a measuring cup and heat gently in the microwave until just warm. Cover and leave them to soak overnight. Drain the prunes and cut into pieces. In the bowl of a food processor fitted with a blade combine the flour, sugar, baking soda, baking powder and coffee. Pulse to incorporate the mixture. Slowly add the frozen butter pulsing until the mixture has the consistency of fine meal. Put the flour mixture in a bowl and add the prunes so they are coated with flour (this will help keep them from sinking to bottom of the resulting dough or clumping together) (#1). Mix the yogurt, eggs and vanilla. Add the yogurt mixture to the flour mixture (#2). Using a medium sized scoop put the dough into a heavily greased muffin tin (#3 & #4). Cook in a 350 degree oven for 20 to 25 minutes until they are firm to the touch and a skewer comes out clean. When they come out of the oven let them rest a few minutes (#5) then move them to a cooling rack (#6).



These are truly remarkable muffins. The coffee flavor comes through and is pleasantly surprising. As a result my wife said next time she might add a bit more coffee. The combination of rum, prunes and coffee is a perfect harmony. Even though the original recipe called for brandy we think the rum is excellent. (My wife said she doesn't know why she substituted the rum, maybe because the recipes usually call for rum when soaking dried fruit in liquor?) The texture is very moist. We will be making these again.

Sunday, February 25, 2018

Cappuccino and the new frother カプチーノ

At home, we almost exclusively drink espresso or espresso-based coffee. On the weekend, we usually have cappuccinos in the morning with breakfast. In the late morning, we have macchiatos. Sometimes, in the afternoon, we have straight espressos.


We went though several iterations of espresso makers. We have been using an Italian-made basic espresso machine called Rancilio Silvia for more than 10 years. We are on the 4th and probably best model we have had. Before this one, we used Gaggia classic which also made decent espresso coffee. Silvia is a totally manual model without anything automatic or fancy. It has only one boiler so you have to wait  (probably close to 1 minute) for the boiler to heat up for steaming the milk after brewing the coffee.

It requires some effort but it does make a good espresso and also steam. It froths the milk adequately for cappuccino and latte. I have replaced and upgraded parts during the year but one advantage of owning Silvia is many 3rd party tune-up/ improvement parts in addition to the replacement parts are readily available. One noteworthy is  the flat shower screen (with flat screw head). Being an Italian machine, the screw head of the original shower screen protruded which made an indentation mark and broke the integrity of surface of the coffee pack  (since the Italian method does not make a "pack" of coffee grind but uses loose coffee when brewing espresso, this may not be a problem for them).

The frother of Silvia is a no-frill basic steam wand and requires some practice to make nice froth but the froth is not as stable or creamy as one made with a commercial espresso machine. Recently, I got a milk frother Nespresso Aeraoccino4 and it works really well. It is rather small and I have to run it twice for 2 cups of cappuccino or latte but it can make small amounts of frothed cream for macchiato. the Breville model can handle larger amounts but not a small amount of cream for macchiato.


To prevent overflowing, it is important not to overfill beyond the max line for frothing milk. It does produce a very creamy stable foam and heats up the milk nicely.


The picture below shows the pattern on the crema indicating good extraction. Silvia is very pesky to have a perfect dose and grind. I use low-speed bur grinder Rancillio Rocky grinder to get the perfect fineness of the coffee grinds. I tamp it only lightly. The machine also requires regular cleaning (back flush using a blank back flush basket with detergent - I use Cafiza) once a week and descale the machine using espresso decalcifier/descaler once a month. Since I use reverse osmosis filtered water, I do not have much of a calcium deposit problem. There are articles explaining how to make good espresso using Rancilio Silvia.


We get green beans (several espresso blends) and roast them at home (using both hot air and direct heat drum roasters) but that is for another time.