PSA: Getting vegan cheese sauce right took me forever
When I first cooked vegan cheese sauce, it always turned out lumpy and awful. I recall a specific dinner where it split into oily pools and grainy bits. The problem was I didn't soak the cashews enough, so they wouldn't blend smooth. Now, I soak them overnight and use a high-speed blender, and it's perfect. Thinking back, I wasted so many ingredients on those first attempts. One batch tasted so bitter, I had to order pizza instead. But now, I can whip up a creamy sauce in minutes, lol.
Wait, gritty paste with oil slicks? That's honestly hard to even picture. @gray_hall4's friend really tried to blend rock hard cashews, that's a straight up disrespectful thing to do to a blender. No wonder it turned into a total science experiment instead of food. Skipping the soak is just asking for a bad time, it's the most basic step. I'm shocked it even looked like sauce and not just wet sand.
Man, that reminds me of my friend's total cheese sauce disaster. She tried making it for a party and used rock-hard cashews straight from the bag. The whole thing was like gritty paste with weird oil slicks. She had to run out and buy a ton of hummus last minute because it was completely inedible. I think she cried a little over all the wasted nutritional yeast. But she got one of those bullet blenders and never skips the soak now.
My buddy Mark had a similar mess with his first cheese sauce. He used those little bullet blender cups and thought a quick rinse counted as soaking. The result was this weird, gritty sludge that just coated the spoon in a gross film. Reading @the_ray's description of gritty paste with oil slicks is dead on, that's exactly what it looked like. He spent more time scrubbing his blender than he did cooking. It was a solid lesson in not taking shortcuts with nuts.