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While I'm eager to hear about anything that is official from Paizo, feel free to throw head cannon's in here, it's where I'm starting from.
Goblins ferment and pickle everything. It's why they have a reputation for eating trash. But if you've ever had goblin cheeses you will either love the complexity of flavor, or vomit because they do take fermentation and pickling to extremes.
Orcs prefer to preserve the identity of their meat, hence they do minimal cooking, as they feel it disrespects their prey to deny what it was, a living creature who was killed for their sustenance. Thus not only is there not a lot of heavy cooking of the meat, but they also eschew sauces that would cover the meat. For this reason Meat is often served with a hearty vegetable stew
Gnomes are amazing patisseries and candy makers because sugar is stimulating. The most accomplished gnome candy makers will claim to cook with non-physical ingredients, and most other cooks, alchemists, and magic users cannot tell if the Gnome is being euphemistic, humorous, or literal when they talk about "sprinkling the cookies with children's laughter" before baking.
The alchemical food from Treasure Vault has a little information on this.