The next day:

Without a doubt, full on English Breakfast. For me it's steak, sausages, eggs, tomatoes, bacon, chips or bubble and squeek, toast, and lashings of butter. If I could, I'd add Black Pudding'. This would be followed through the day with any other shit food that takes my fancy, including sandwiches, lots of ice cream, cake, chocolate. Maybe even a burger or 3 thrown in.

While drinking:
Peanuts

When finished drinking:
Chicken
Battered hot dogs and chips or meat patties and chips
Meat pie and fresh bread
Maybe even a roast dinner, if I cooked it beforehand.
Left-over samgyeopsal (often in a sandwich)

This is one reason why I rarely indulge anymore. It's not the drinking that's a problem...it's the aftermath!

Edit: I don't eat all the 'finished drinking' food, just one or two of the above. But I probably could 

During imbibing-
Back in the days of 10-15,000 won fruit plates, it was always those. Nutrients, vitamins, hydration.
Otherwise, pickles are good. Fresh or pickled tomatoes. Tapas. Russians and Euros have a good idea of what to eat while drinking- be refreshed, not downing fried crap. That mackerel you get at Korean places is good too. "Why do I feel like shit the next day?" asks person who shoveled crap into their mouth while drinking.

Always a wrong bet- Taco Bell, Fried Chicken, Chili Cheese Fries, White Castle, Lamb kebabs (love em but they exacerbate gut rot), any Korean spicy soup, dwaeji galbi, samgyeopsal (but weirdly not moksal or jokbal, must be the extra grease),

3.6 Roentgen (not great, not terrible/Really hit or miss)- Pizza, American Chinese, Fish and Chips, Bangers & Mash (can either be really great or really dodgy), raw fish (see B&M), Jimmy John's, mozzarella stix, soondae, ddeokbokki.

Next day? Assuming that drinking went well, something refreshing. Eat good, refreshing food and you can beat the next "blahs". Something like soba or a nice sandwich or a poke bowl.

If you've hit the blarghs, then cold pizza is always solid. Mac & cheese is a classic.

Full breakfast is always best enjoyed when you know you're winding down but you aren't wasted and you know you won't be gutrotted the next day. If eaten while wasted or while gutrotted, those eggs can cause things to go south pretty fast. It is great after a night of mild drinking where you know it's just going to be a relaxing day of watching football or something.

This can actually become a point of contention with my friends and I cuz I want to go to places with a good beer selection and they'll want "a meal" and more often than not those two ideas are not the same and don't have much crossover.

Mcdonalds breakfast is my go to. Never really interested in their burgers but a sausage and egg mcmuffin with a greasy hashbrown in the morning will always be welcomed after a night of drinking.

Grabbed some mcDs drive thru this morning.  (Or as the Koreans call it.  Make Morning.)