Does it matter what I eat at the Battle Buffet?
Solution 1:
I have the official Pokémon Sun and Moon guide. It states:
After you've finished your meal, the hostess will have a look at you to see how satisfied you are. Depending on how full you look, she'll give you one of four rewards: a Honey, a Big Mushroom, an HP Up, or a Max Revive. Keep in mind that it's not just how much you eat, but how delicious the dishes were.
So presumably? The guide only says to see what food goes quickly and what the chefs say to determine their quality.