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In the interest of science I purchased some of the Sainsburys espresso blend today.
My first impression on opening the packet was the fishy smell, quite often I smell this with a dark roast, also a slightly stale smell, but not as bad as I expected. Second was that the beans were quite oily, and not what I would call a Northern Italian style roast. It was not a really dark roast but quite dark.
I set the Mazzer rather finer than my current home blend required as the roast was quite dark, and (by luck) got a 28s slightly short double. The colour of the pour was quite nice, if a little thin. The crema in the cup was a nice colour with a little flecking, but not very deep.
As a control in the test, I got my fiance to try it without telling her it was not a home-roast. I could tell by her face that she wasn't over impresed, she said it tased rather thin with little body, and a bit "toppy" i.e. no bass notes in the coffee. I then tried it myself. Yes it was a little thin, and a touch bitter, but better than I expected. There was not much sweetness, and the syruppy texture from a really fresh roast was not there.
This is very far from a home roast, or a fresh roast from a pro, but way better than pre-ground Illy from a can or Lavazza beans I tried in the past.