It's not really swiss, that's just the name it was called but I don't remember why!  My Mom used to make this a lot but she didn't have a slow cooker so it was done in the oven in a graniteware roaster.
One of my all time favorite meals.  Mashed potatoes to help sop up the tomato "saucy stuff" and baked carrots or a green salad with it.  YUM!  Makes my mouth water to think of it.  Now if only I had the energy to make it today!  Maybe tomorrow.

https://www.themagicalslowcooker.com/slow-cooker-swiss-steak/

I will try making it in my slow cooker, but it has to be pan-fried (browned) first anyway.  That way it's not bloody tasting.  NO ONE would like it that way, trust me.