Hi Sandii ~ sorry for not responding sooner. I didn't see your post until now. I can't actually tell you how much of the stew to feed your dog. It depends on your dog's current weight/size and activity level.
If you are new to homecooking or raw, I would suggest that you read as much as you can on this forum and in the many other links within this forum to determine the appropriate weights or volumes to feed. If you are just supplementing your dogs regular kibble diet with a special treat then you might want to mix a 3/4 portion of their kibble with enough of the stew to make it look "meaty" and see how it goes down (and comes out