The fracturing and friction of coffee beans during grinding generates electricity that causes coffee particles to clump together and stick to the grinder. Researchers report Dec. 6 in the journal Matter that coffee beans with higher internal moisture produce less static electricity, which means less...
Any black coffee, including instant, will taste gourmet with a bit of lemon peel, honey, and, if you're feeling fancy or need something a bit sweet, a nice dash of condensed milk. Try it next time you're at a meeting where they only have shit tea and coffee, you'll thank me later.
The lemon trick was a common thing in the 20th century to help mask the bitterness of improperly brewed or processed espresso, but it’s died out since production and brewing of coffee has been refined in the modern era. Still an ok, calorie-free way to liven up some shit coffee.
Source: my history class textbook from like…10 years ago.
Very tiny amounts of salt will also make low quality bitter coffee a lot more palatable and help you use less sugar, so I assume the sourness of the lemon probably has a similar effect. And when I say low amounts I mean like maybe 50mg of it for a large cup.
Oh who did a video on that? I forget. Anyway, what the experimentation showed was that it was only really useful in cutting the bitterness in really bad coffee (as you described), and that the amount of salt to add to a single cup was something like three or four grains of table salt.