There is a new product being funded on Indiegogo that is supposed to cold brew coffee in 10 minutes. It uses vacuum to draw the water through the grounds to speed up the process. Here is the link...
https://www.indiegogo.com/projects/prisma-cold-brew-coffee-technology#/So I decided to test this process using my vacuum tumbler. I loaded it with the exact amount of water and coffee grounds that I use in my OXO for comparison. This way I am familiar with a 24 hour cold brewing cycle comes out in strength and flavor compared to this.
Loaded up the chamber and left in the tumbling insert...
Set timer for 10 minutes. This batch got a tumble and vacuum for 10 minutes...
Now I am not aware of how much vacuum my tumbler had using a hand pump and how much the Prima does so this is not a fair comparison obviously. I am just trying to determine how well this process works.
After the tumble was over I dumped the brew into my OXO to drain and test.
The results were not bad for 10 minutes honestly. It was not as strong as a 24 hour brew and the flavor was more mellow but I was able to make a decent cup of coffee with it. Next time I might try 60 minutes and see if that yields better result.
My take is that there is something to this method and maybe under much higher vacuum there could be better results. This would be great in a pinch if you were suddenly out of cold brew