From the Super Mario Wiki
Peronza Plaza is a location in the Luncheon Kingdom in Super Mario Odyssey, acting as a hub of the Kingdom. It is located in front of the arena of the mission The Broodals Are After Some Cookin'. It is a small town that is filled with salt and oversized food, with the town being mainly inhabited with Volbonans, with other visitors coming for the Cooking Carnival, where the town is decked out with bowls of Stupendous Stew. At the entrance of the town is a Checkpoint Flag, a pair of Binoculars and oversized food which leads to the other half of the town, where there is two buildings, one which is this kingdom's Crazy Cap, and the other which requires the player to wear the Chef Hat and Chef Suit to enter, and contains a secret area with an abundance of Magmatos. In front of the buildings is a pot of stew which will give the player Power Moons if the player throws Golden Turnips into the pot, and coins if regular Turnips or beans are thrown in. Right of the Crazy Cap store is three turnips, one of which is golden, and in between the buildings is a stack of Crates, one of which contains a Power Moon that is released when broken. After the main game is beaten, a Steam Gardener appears behind the plaza and will give the player a Power Moon if the player talks to it with the Mechanic Cap and the Mechanic Outfit. Peach and Tiara can also be found next to the pot of stew and will give Mario a Power Moon when spoken to.
The mission Find Band Members in the Luncheon Kingdom! in the game's "Playing in VR" mode takes place in Peronza Plaza.