Step 1 - Create a cheese in a tray, any type (I used brodgar blue)
Step 2 - Put tray in cheese rack, any rack (I used cellar)
Step 3 - Right click on tray within rack, slice up cheese
Step 4 - Observe counter start ticking up on empty tray
Step 5 - Add lots of curd at any point while ticks are accumulating
Step 6 - Observe counter finish and you get the appropriate cheese (cellar cheddar in this case)
I have not tried to get cheese without curd using this method yet. I suspect it will not work, as the tick over event didn't generate gouda so it's obviously aware that the cheese tray contains curd and not brodgar blue.
Most I could see a player getting out of this is saving some time while his cow works up the milk.
(P.S. Let us store empty trays on racks!)