So, we just started testing the food scraping rebirth.
As far as i know a plant that grows from the seed will be in better conditions in terms of vitamin, minerals etc than a re-growned plant. The re-growned is tired old, but its nice to test it out, i am planning to use the onions to keep away the slugs.
If you have kids is an interesting project to do with you kids.
So, you start by taking the top and botton part of the onion and place it in water.

Then a few days after, around 5-6 you will have this,