On a des valeurs en Belgique. Surtout sur l'assaisonnement des frites, la hauteur du col de mousse de la biere, et le caractère optionnel d'un gouvernement de plein exercice.
I haven't seen anyone mention nutritional yeast yet, but that's become my go-to seasoning for almost everything; popcorn, pizza, scrambled eggs, bread, ramen, soft pretzels, and of course on fries. So damn good!
(Yes, I realize the name "nutritional yeast" sounds vaguely unpleasant and unappetizing, but I promise it's incredible if you like savory flavors, and it can also be used as a cheese powder substitute in vegan recipes.)
In Belgium: Tartare or Mayo. Andalouse for the gal, thanks
In the UK: Salt and Vinegar
In both cases: I will have to change seat if you plop yourself in front of me with your poor fries inundated by ketchup. Only the French do that, and it is a Casus Belli in my book.
Ranch dressing, or a mix of half ranch dressing and half ketchup I call "krantchup". Specifically Marie's ranch mixed with Primitive Kitchen ketchup is so good on fries.
hong kong mcdonald's is currently serving shaker fries, where you can purchase a packet of seasoning powder along with your fries and shake it all together in a bag.
anyway, my all time favourite (so far) is mcdonald's honey bbq seasoning; fucking delicious. their sakura shrimp seasoning is pretty good too.
i got frozen fries that i heat up in the air fryer occasionally whenever i get a craving; tried some taiwanese popcorn chicken seasoning (i bought a jar of it from a taiwanese noodle restaurant) on it and it's really good.
Rogan josh curry sauce (although most other curry sauces are also good). Chips and curry sauce is a really popular fast food in the UK, but the curry sauce in question is much closer to a brown sauce than it is to anything that's usually associated with the word "curry". So I make my own curry sauce and put it on instead. This does, of course, completely ruin the "fast" part of "fast food", but it is very tasty
On fries I really only do ketchup. I use Sriracha on almost everything else that's primarily potato, but not fries. I used to use A1 steak sauce every so often a while back. I hadn't thought of that in years; might need to go pick up a bottle.