Favorite food

The main character's favorite food is a reoccurring theme in the series, appearing on all of the initial naming screens. In all of the games, it is cooked by the respective main character's mother. It is not an actual inventory item, however, and is merely mentioned in text.

In
The favorite food is referenced very little in, being served by Ninten's mother and in Magicant, with a couple of NPCs mentioning it. When eaten, it restores the party's HP and PP completely.

Unlike the other two games, there is no canon default for it, and so the favorite food is completely up to the player. In one of the "Earth Bound" prototype cartridges, the existing save file used Pizza. However, it is unknown whether this was an official save file from Nintendo or a save file from a previous owner.

In EarthBound
Similar to the first game, in EarthBound it is served by Ness's mother. Paula's mother also learns to prepare it as well, although she mentions that she's only just learning and still needs to practice. When eaten, it restores the party's HP and PP completely. In the letter at the end of the game, in the letter from Ness's mother, she mentions that they haven't been eating the favorite food as much lately.

In Mother 3
In Mother 3, the favorite food is somewhat different. Hinawa makes it for the Lucas and Claus during the Prologue. Many villagers of Tazmily say that it was their favorite food and that Hinawa always made it for the people of Tazmily. It is also possible for a Mystery Metal Monkey to drop your favorite food, although like the "good experience" it gives, you don't actually receive it.