If they are truly wild onions they are great to eat any way you like. They have more of a garlicy taste than regular onions. There is as plant here in Texas that looks just like an onion but is not edible called Crow Poison. As far as when to pick them any time is good. But growing in your grass? Be careful. Wild onions usually grow in damp places like ditches. Dig one up and take a pic of it
My yard is a veritable mud pit right now. We had to have so much grading done when we got our new home and it has rained quite a bit. I live in South Carolina and I don't know if we have Crow Poison here. What does it look like?
When still in the ground it looks very much like what you know as green onions in the grocery store. When you dig one up the bulb will be round about the size of a marble and when you smash it it will not smell like onion or garlic. Not much of an odor at all. When left alone they will turn into a rather pretty white wildflower. I think another name for it is Spring or Day Lilly
Then if it looks like an onion, smells like an onion and tastes like an onion it is a watermellon and delicious no matter how you prepare it. When I lived in East Texas we had them all over the place. I would put them in salads, in a crockpot with a roast, all kinds of ways that you would a normal onion Now I am in an alkaline semi-desert and they don't grow here. Got lots of crow poison though.
I don't know where you are located at but there are wild onions all over the south. They look a lot like the green onions you buy in the store, but they grow uninhibited in ditches, yards, anywhere there is enough water etc. As far as onions go there are many many hybrids in white yellow red and purple as well as long day and short day varieties
For Christmas I'm getting a book on edible wild plants of Tennessee.
