This gizmo looks like it might do the trick.

Here is a link that might be useful: Silvermark White Toss and Chop Salad Chopper

Probably used 2 knives...criss-cross...cut cut..

I have this, though I don't think it's what you're talking about if they did it in her serving bowl. But I really like it. I use it almost every day for salads and it's much faster than chopping everything individually.

Here is a link that might be useful: Salad Chopper

I use an alligator chopper like this. Makes short work of any vegetable. It's great for salad and really useful when we get together for our Salsa canning weekend.

Here is a link that might be useful: Veggie chopper

Thank you all for your helpful suggestions. They kind of remind me of my mother's old, old, chopped liver chopper-which I have and sharpened. thanks again.