Bob and Alice are lost in the woods, when suddenly, a wolf that talks and walks on two legs invites him to his cave for dinner. Bob and Alice accept the invitation, only to wind up in a big black stewpot full of soup while the wolf chops carrots and other ingredients into the broth.
Other likely culprits are a Cannibal Tribe preparing a cannibal stew, a Big Red Devil boiling sinners in Hell while prodding them with a pitch-fork, or a Wicked Witch looking to use up those leftover German kids she has lying around.
Was very common in the Golden Age Of Animation, usually along with a gag about the person being stewed wanting to know what smells so good, or why his "bath" water seems like it's getting hotter and hotter.
Anime & Manga
In Ranma One Half, Ryoga was captured by Genma and the tour guide while in pig form. For some reason, they decide the best way to cook him is to throw him into a pot of boiling water- while still alive. Fortunately for Ryoga, hot water turns him back into a human. "Oh, it is poor person! Now we cannot eat!"
Film -- Animated
Seen in Surf's Up, where the oblivious Chicken Joe thinks the native Pen Guans are giving him a hot tub bath.
Film -- Live Action
In the orgy scene from Conan the Barbarian, a large black cauldron is carried in, containing what appears to be pea soup. It actually contains a soup made from human corpses (the cultists are cannibals).
Two explorers are captured by cannibals, stripped naked, and thrown in a cauldron of water. The water starts to get hot and the explorers begin to panic. Suddenly, one of them starts snickering. "What's so funny?" "I just peed in their soup."
When trolls capture The Hobbit's party and are arguing about how to cook them, this is one option they consider.
In The Road To Oz Dorothy and company encounter the Scoodlers who capture them for soup. Although they escape without ever actually going in to the cauldron, they do see the Scoodlers preparing the cauldron and discussing what vegetables to use.
In the H. Rider Haggard novel She, a tribe of cannibals follow a ritual where they heat a large pot red hot, pick it up with handles and then throw it over the victim.
In some versions of Three Little Pigs where the big bad wolf attempts to get into the third pig's house via the chimney (after failing to blow it down). What he doesn't know is that the third pig has a boiling pot over the fire, and the wolf gets cooked in it.
In the children's book Wombat Stew, a dingo has one of these ready to cook the wombat in. Being a book for young children, the wombat gets rescued before he's put into the pot.
Live Action TV
In Black Tie Affair, a short-lived TV series from 1993, one of the major characters is a clothing designer, and they're shooting photos for his upcoming catalog. The shoot in this instance is of a (white, female) explorer trussed up in a pot surrounded by natives. The black male models playing the natives complain that it's racist, so they are dressed as lawyers instead - but they still have the girl trussed up in a big pot.
The Lost Tribe of the Orinocco attempt to cook Tim and Bill in a pot in an episode of The Goodies.
In the Dinosaurs episode "Monster Under the Bed" the eponymous monster plans to cook Robbie, Charlene and Baby in a big cauldron, but doesn't get around to putting them in before he's stopped. We do see him preparing the vegetables that go in the pot along with them.
In Grandia, the hero and the heroine search for the lost Token Mini-Moe in the valley. When they found her Non-Human Sidekick flying madly around her bag and a cauldron full of stew, the hero got enraged and the heroine fainted. Subverted, of course. video here
The final scene of Jungle Hunt for the Atari involves rescuing a lady being slowly lowered into a cauldron by a cannibal tribe.
In some Kirby games, Kirby can get the chef hat, a single-use ability that sucks all the enemies on-screen into a pot of stew and cooks them into recovery items. In Super Smash Brothers Brawl, this is Kirby's Final Smash attack.
In Secret of Mana, the hero gets captured by goblins who put him in a cooking pot, and stays there until the heroine rescues him.
In the old PC quest game Toonstruck, there was a B.B.Wolf who tried to do this to the protagonist.
In Ōkamiden, Chibiterasu and Manpuku fall into a giant pot of soup. The demon cooking it decides to cook them with the soup, but Manpuku saves himself and Chibi from being boiled to death... by drinking the entire soup.
There is another example of this trope not so long afterward; Charity is tricked into approaching a large pot by the demons after refusing to cook for Orochi, and is pushed into there about to be boiled, but Chibiterasu saves her.
In Homestuck, the crocodiles who live on the Land of Heat and Clockwork greet Dave Strider--the hero of their land--by sticking him in a cauldron of hot water and pelting him with onion slices. Dave just climbs out, and the crocodiles don't bother him again. Whether they actually wanted to eat Dave, or the entire thing was just a weird greeting (as Terezi claimed) is never clarified.
The Homestar Runner game Thy Dungeonman 3. The Fat, Fat Friar clonks Thy Dungeonman over the head with a mutton chop and throws him in a stew pot to cook.
The webcomic Banished! depicts a scene where the (alien) protagonist is captured by Amazons and thrown in a cauldron. he pees in the water, telling them "That's what you get for not killing your food before you cook it."
My Little Pony: Friendship is Magic: during the Season 3 finale, Rainbow Dash is trussed up and put in a pot by Fluttershy's animals. They even get out the fancy wall-shadows and dance around the pot!
Also mentioned in this song with regards to a character who is an allegedly evil witch.
Rocky and Bullwinkle: Rocky & Bullwinkle got caught and tossed in a cauldron. Executives complained because it was portraying cannibalism. Writers responded by Lampshading the fact that, since Rocky was a squirrel & Bullwinkle a moose, and the savages were human, by definition it wasn't cannibalism.
In the Tex Avery MGM Cartoon "What's Buzzin', Buzzard?", a vulture cooks another in a pot. The vulture in the pot smells something cooking and asks for a taste, and it's only when he bites into his own leg that he realizes what's going on.
In "His Mouse Friday", Jerry dresses in blackface and forces Tom into a pot as he cuts up the vegetables. This cartoon is rarely shown anymore due to the fact that it makes Mammy Two-Shoes look progressive.
A tribe of pygmies try to do this to Rebecca Cunningham in the Talespin episode "The Bigger They Are, The Louder They Oink." She doesn't like it.
On an episode of Spongebob Squarepants, Patrick (starving in the wild) tries to cook Spongebob in a soup, complete with carrot bits.
Cauldrons of this size can be used to scald hogs -- dipping them briefly in boiling water so their bristles can be removed from the hide.
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