If you do not have one of these onion/veggie choppers in your kitchen, I recommend you get one. We love the one we have and my husband uses it all the time. It produces perfect chopped onions/veggies to use in all kinds of recipes.
It also has a handy dandy measuring cup on the side. You just turn the chopper on the end to see how much you have chopped.
You can chop more than one veggie and still have the measurements.
No risk of chopping fingers with a knife!
Onions, red bell pepper, green bell pepper and mushrooms all the exact same size!