There’s a trick to doing trills. Or maybe the word trills is incorrect. It’s a technique thing I saw Casey Sokal do when I was at York in the 80s. Never saw it before on the piano. A way to play three fingers on the same note, a white note. Maybe it should be called 3 fings. Same thing with making kasha. A trick. The water has to be boiling and then you let it sit on a cold element until you smell it permeating the room.