It's also incredibly easy to make. I posted a recipe three years ago (yikes) and it's one I make often.
Onions are also good for your skin and have anti-ageing properties. My Grandma used to poach a large onion in milk and then eat it for lunch. She had fab skin. She also smelled of face powder and had a lovely dressing table with exotic and interesting cosmetics and potions.
She once painted my nails a rather gorgeous shade of creamy orange when I was a child and staying the night. At home the next day I was ordered to remove it. One day I'll find that perfect 70s colour again and really do it justice.