I suppose you could but honestly I'd find them much easier to de-stem before dried than after. It will be more difficult to remove the stems after drying. Raisins are sticky. ;)

Dave

Unless they are covered in chemical spray, just put the whole bunch in a collander and rinse them off.

Then pull the grapes off the stems. If they are ripe they come right off. As you pull them, place them in a bowl. You can do it while you watch TV.

In fact, if they are ripe, you can comb your fingers gently through the bunch and a whole bunch of them will just fall off the stems.

Then you simply pour the bowl into your dryer and spread them out by waving your hand lightly over them. They are round so they don't stack. That makes them easy to spread into one layer.

Trivia: decades ago, they would lay a long piece of white paper along the rows of grapevines. The workers would cut the bunches and lay them on the paper. They stayed out in the sun until they were dry, and then the paper was simply rolled up, raisins inside.

Then, of course, someone would have to sit on the assembly line and pick all the raisins off the stems. Boxes of raisins used to contain many raisins with little stems still on them, and before baking with them, the homemaker would have to sit and pick through the raisins to remove all the stems.

I dry my grapes in net bags that have very small holes (so ants can't get through) out on a screen raised up on cement. I put the whole bunch, stems and vine in the bags and put an old framed window on top..sort of a solar dryer. After about a week (depending on how hot it is) they are fairly dry. I put them in mason jars with cheesecloth tops to let them dry a little longer, turning them once in a while. Later I too sit in front of the TV and pull out the stems. Makes me feel better about watching TV ha!

I let my grapes dry on the vine!

The resulting raisins come iff the main stems easily, but many of them have their tiny personal stems attached.

When I want them to be nice, I roll them around in a colander, and the tiny stems fall through the holes (into a bowl if indoors, or sometimes I do this outside and just let them fall on the ground.). There may be a few big twigs or leaves to pick out, too.

You need a colander with the right sized holes for your raisins -- if yours does not suit, maybe borrow one from a friend or neighbor. I have several, with different sized holes because I use this same method for seed saving.

(TBH, I eat a lot of the raisins straight out of the bag, tiny stems included. More fiber :). But I would not serve them to company that way.)