It’s a Danish condiment commonly used on open top sandwich (smørrebrød) to be eaten with either roast beef or Danish fish stuff (tons of fish dishes in Denmark). It’s mayo + other spices commonly found in Danish households/supermarket put in a blender, e.g., onions, curry power, garlic, sugar, tumeric, mint, sour cream, and a hint of lemon squeeze, within reason. It is basically a funkier, zestier, mayo. The blended fresh stuff, especially mint and lemon saved the mayo to be somewhat edible. Bottled processed remoulade is as gross as it sounds.