Elixir Soup

The Elixir Soup is a soup made by Link's Grandmother. If Link drinks it, it will fully heal both his Health and Magic. Aside from that, it will double you attack strength, making your sword glow. This will last until you take damage. It can be stored inside a bottle, and your grandma will give you two helpings.

The Wind Waker
Link can get the soup after he cures his grandma, when she falls ill. Link did this by going to Fairy Fountain on Outset Island to get a fairy to heal her. After healed, Link can always get a bottle of soup from here when he runs out.