After many trials an errors I can get now a consistent excellent shot with a wide available bean
I got yesterday another bag of Lavazza beans after being successful previously. I went again through all the loops and I've verified what works and what doesn't. First I'll post the detailed measurements and then I'll describe the technique.
Lavazza Super Crema
10-11 grams in single LM basket
205F
extraction time: ~40 seconds
extraction volume 1 Oz
Results: chocolaty taste, mellow, very easy to drink, no brightness. Too weak to drink with milk.
Technique:
I have to use a very fine grind setting to achieve a long extraction time. In my Compak K10WBC I use a setting of 23 perpendicular to the front of the grinder. If I use a bigger setting the chocolaty effect will diminish and I'll get a 27" regular shot. Another important factor is the distribution technique. I have verified it and makes a difference. I use a regular funnel and a colander. I place the colander on top of the funnel and use a brush to push the grounds into the basket. After making a mountain, I flatten it by tapping it against the table. For this I use the double spout tip which gives me a stable point to tap evenly. If I don't use this technique, the flavor is different. This also helps me measure the quantity of coffee before hand and keep a good distribution. I have the coffee measured in a 1/4 cup before getting the portafilter out of the machine and then I dump the grounds into the colander. Temperature will also make a difference. I get better results in the 205F range. I dry the basket with a paper towel.
That's all.
Cheers




