Kitchen (Luigi's Mansion 3)
From the Super Mario Wiki
The Kitchen is a location in Luigi's Mansion 3. It is found in the Mezzanine on the second floor of The Last Resort. It is a kitchen directly east of the Restaurant. Chef Soulfflé is fought here. The blue Gem can be found here.
When Luigi first enters the kitchen, it is engulfed in smoke from the chef's cooking. Both Luigi and Gooigi must vacuum the smoke to reveal Chef Soulfflé at the grill. He becomes angry and starts attacking them with his frying pan. Once he is defeated, he drops the fourth floor elevator button, which lands in the sink. When Luigi goes to claim it, however, a mouse appears and swallows the button, then flees to the restaurant area.
There are shelves in the kitchen covered with food and hidden coins. There is a grill in the center of the room. There are two sinks in the southeast corner. There are pumpkins and watermelons scattered on the floor. There is a slab of meat on the shelf in the northwest corner. Luigi can bring it down, then hold it over the grill to get coins. There is an oven in the northeast corner Luigi can use a Suction Shot on to pull it open, revealing a turkey. He can also hold it over the grill to get some money. There are two freezers in the north wall of the kitchen. The one on the right is a fridge, while the one on the left is a secret passage leading to a chain Luigi can pull to reveal a fish-like creature with Gold Bars in its mouth. Gooigi can walk through its teeth to get the gold bars.
To get the blue gem, Luigi needs to find an ice block in the left freezer with the gem inside. He must hold it over the grill to melt the ice, releasing the gem.