"Майонез, будь ласка."
I think it's fairly popular, maybe not in a traditional cuisine but mainly in salads from soviet era and such. Traditional cuisine primarily uses sour cream
Nowadays mayonnaise is a big deal xD Hardly any salad can be made without it. It's like a staple :)
There are so many various types of mayonnaise in Ukrainian supermarkets. It's rather incredible.
Versions with horseradish (хрін) are particularly popular.
Mayonnaise with horseradish really exists. But it does not particularly popular.
With horseradish? Really? I mean horseradish itself is in fact popular, but mayonnaise with horseradish? I am not sure I have ever seen that
Now you're making me doubt my memory. Perhaps it was ketchup with horseradish. But then again, I remember horseradish appearing everywhere.
Martha Stewart's "Ukrainian Mayonnaise" recipe includes horseradish, so maybe I'm not crazy. http://www.marthastewart.com/355907/ukrainian-mayonnaise