The nastiest moment from House of the Dragon Season 3, episode 3 isnt even in the book
Rhaenyra serves King's Landing's nobility rats at a feast in "House of the Dragon" Season 3, episode 3.

While I would bend the knee to Queen Rhaenyra Targaryen (Emma D'Arcy), I would not want to attend any of her dinner parties.
SEE ALSO: 'House of the Dragon' pulls a Daeron Targaryen switcheroo that isn't in 'Fire and Blood'In House of the Dragon Season 3, episode 3, Rhaenyra throws a banquet for the nobles of King's Landing. The main course? Cooked rat, served atop an unappetizing black sludge. Not since Arya Stark served Walder Frey his own sons has a Westerosi meal disconcerted me so much. It's pure Game of Thrones-style nastiness, yet this scene doesn't even take place in George R.R. Martin's Fire and Blood.
Initial horror aside, the nobles do deserve it. (And you know what? So did Walder.) Rhaenyra cooked up the rat stunt as retaliation for their treatment of King's Landing's poor. While the city starved as a result of Corlys Velaryon's (Steve Toussaint) blockade, the nobles feasted off the food they had saved up in their store houses. Rhaenyra's rat dinner gives them a taste of the scarcity the smallfolk faced, albeit with some surprisingly stylish plating.
The rat feast, it turns out, is also a distraction. While the nobles are in the Red Keep, the Gold Cloaks are seizing their provisions and redistributing them to the city's poor. Later in the episode, Rhaenyra will distribute some of this food herself.
It's a bold move to prove Rhaenyra's allegiance to the smallfolk, and by the episode's end, it seems to have paid off. The commoners of King's Landing embrace her generosity. (Even if Rhaenyra was also responsible for Corlys Velaryon's blockade in the first place.)
However, Rhaenyra is playing with fire when it comes to her relationship with the Seven Kingdoms' nobility. While she proclaimed she had invited everyone to dinner as a "conciliator," she quickly revealed her true goal to be more punitive. Now, she's certainly struck fear into the hearts of her dinner guests, but could that cause resentment that leads them to mobilize against her?
While Rhaenyra's intentions here are good, her plan's disgusting execution signals a turn towards cruelty that may very well not stop with these nobles. In Fire and Blood, Rhaenyra develops a reputation as a vindictive ruler, earning her the nickname "Maegor with teats," a reference to former Targaryen king Maegor the Cruel. Much of Season 3, episode 3 is devoted to showing how Rhaenyra's mental state — strained to the breaking point by the death of Jacaerys (Harry Collett) and the unceasing demands of ruling — is slipping towards that cruelty. The episode even draws a musical parallel between Rhaenyra and Daenerys Targaryen's mental snap in Game of Thrones Season 8, suggesting Rhaenyra is headed down a similar tragic path.
So, while Martin never actually wrote out Rhaenyra's rat feast, it is absolutely in keeping with Rhaenyra's arc in the books, all while adhering to show Rhaenyra's more sympathetic attitude towards the smallfolk. Plus, it continues that great Game of Thrones tradition of truly upsetting meals. Remind me never to make a reservation at the Red Keep.