Sandy, those look like the ones you can just eat. There's a really easy test once you've got them ripe. Slice it in half and lick it. If it's worse than chewing unripe lemons, then you have juicing Naranjillas. If it's sweetish or just pleasantly tart, it's an eating Naranjilla. I still don't know how to tell exactly from just looking at the plants, except that eating Narnajillas tend to be a bit bigger than golf balls, while juicers are much bigger.
Edit: here's a picture of ripe eatin' naranjillas, which I bought today at market.
