Egyptian onions

I have all these Egyptian walking onions at both ends of the Chris plot. I love them. We have scallions almost year round but really enough is enough, their job is to multiply and multiply they do so there is a thicket at the east end.
I'd like to plant tomatoes n this spot.
I've started reducing the onion population. I yanked a big handful today. I cleaned them like leeks, chopped them into 3" pieces, douced them with olive oil, salt and balsamic vinegar; and put then in the oven while broiling lemongarlicsagechicken. also very tasty. The onions carmalized, I moved them to a lower shelf and cooked them 10 min more, they were very good Elliot kept coming over and sampling them.