Mia has not said in canon what her favorite food is but I'm going with truffles. Or tea. She can't always help being a little rich girl. Not to mention Vane has truffles and other underground-type foods in abundance thanks to the Cave of Trial. Mia also has a definite love of seafood from Lann. She's convinced no one in the universe has better fish.
Food is actually part of the Mother 3 healing system. Certain characters like and dislike different foods, which makes the food healing items more or less effective. There's also a nausea battle status that prevents a character from eating healing items aside from fresh mints, which will cure the nausea. Being the protagonist of a Mother game, the player actually gets to pick what Lucas's favorite food is. But the default option is omelets. In comparison, Ninten of Mother/Earthbound Zero likes prime rib and Ness of Mother 2/Earthbound likes steak. Lucas also likes cheese, like his father Flint.
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Food is actually part of the Mother 3 healing system. Certain characters like and dislike different foods, which makes the food healing items more or less effective. There's also a nausea battle status that prevents a character from eating healing items aside from fresh mints, which will cure the nausea. Being the protagonist of a Mother game, the player actually gets to pick what Lucas's favorite food is. But the default option is omelets. In comparison, Ninten of Mother/Earthbound Zero likes prime rib and Ness of Mother 2/Earthbound likes steak. Lucas also likes cheese, like his father Flint.