My grandma always dyed eggs with onion peels--that's how they did it back in the day! We made some last year but struggled with keeping the onion peel on the egg. This looks like an easier alternative.
Outback Steakhouse Bloomin Onion Recipe (dipping sauce too!) I only did the dipping sauce to pair with my onion rings. The sauce had a little horseradish in it to give it a kick and some ketchup and mayo.