This is my favorite ask ever and I hope you don't mind that I turned it into a thread because nothing brings me more joy than rambling about Harbingers and food!

Disclaimer that these are all entirely my own headcanons and some are a little silly.

Pierro: Cognac and camembert. The stock character Pierrot was immensely popular in France in the 19th and 20th centuries, and was often used to market goods. Cognac and camembert (we can ascribe those to Fontaine) were among the products advertised using his character.

Capitano: Mondstadt’s northern apple stew. I currently still HC Capitano as being the Bloodstained Knight, so his favorite dish is a Mondstadt classic of braised meats and sweet apples. Its distinctly nostalgic and no longer a dish he can bring himself to eat, but he yearns for it all the same.

Dottore: Thinks food is a waste of time and would get his nutrients via IV if it were up to him. Unfortunately, it’s not up to him and Pantalone drags him to extravagant dinners, where Dottore grudgingly discovers that he does, in fact, greatly enjoy food. He’ll kill you before saying it—because it would prove Pantalone right—but his favorite food is actually chocolate (and this part is directly lifted from the Commedia).

Columbina: Honey cakes (Medovik if we’re Snezhnayan about it). In Scottish folklore, Seelie were often depicted to enjoy offerings of milk and honey, and other sweets and cakes (and I’m big on the Columbina Seelie fan theory).

Arlecchino: Something hearty and filling, like a fish stew or paella that can feed many. Not for her own sake but for that of the children in her care. She thinks its despicable how much food goes to waste and she’s intensely derisive toward toward those who don’t appreciate it.

Pulcinella: Ukha, a comforting fish soup reminiscent of family dinners on the Snezhnayan coast. The responsibilities of being Mayor keep him away from the dinner table, unfortunately.

Scara: Canonically doesn’t eat but, as Raiden’s vessel, he definitely has a soft spots for deserts. In his voice line about food, he talks about tea, saying “the more bitter, the better” and I think that’s a front because he doesn’t want people to know how much he adores sweets.

Signora: Steak (rare) glazed with a chocolate chili sauce and served with a red citrus salad (talking blood orange, bright raspberries, pomegranate seeds—all drizzled in honey).

Sandrone: Anything you can eat with one hand and not make a mess. Like Dottore, she’s often absorbed in her research and eating is both time consuming and a nuisance. I get penne in a marinara sauce vibes from her; bowls of pasta she can absently eat while she tinkers.

Pantalone: Outwardly, he’s a man who loves all things luxurious and expensive: spoonfulls of caviar and butter-soft oysters, decadent chocolate cakes glazed with brandy. But deep down, there’s a part of him that still believes nothing is better than a slice of warm, fresh bread.

Childe: He might not commit to having a favorite his voicelines, but it’s definitely slow-cooked bamboo shoot soup when (and only when) Zhongli makes it. It’s not even about the soup itself; it’s about the meticulousness with which Zhongli cooks and serves it, about the way Zhongli’s long eyelashes flutter each time he tastes it, about the way he stands there in solemn contemplation as he adds a little more pepper, a little more salt. It’s the way he looks at Childe expectantly when they finally sit down to eat, and the way Childe finally feels himself slowing down, meeting Zhongli’s pace to appreciate it.