This is my favorite way to eat sweet onions. If you have a toothpick and an ice cube, you can reallly draw out the sweetness of the onions.
Sweet onions are the most delicious served as thickly sliced "steaks" using this method. They look great and are really tasty.
By adding an ice cube, the onions will steam slowly and increase in sweetness.
Enjoy Japanese food around the world.