That is one thing I bought at IKEA I’ve never developed a taste for, despite being one quarter Swedish and trying diligently these last few years to learn to appreciate the foods of my distant cousins. The sweetness of it was very off putting and I’ve never got used to it. Swedes seem to favor a sweet condiment with meat, as in Lingonberry jam with meatballs. In the US, at least, a cream gravy is always served with kottbullar. Even Senap Grov, IKEA’s Swedish coarse mustard, is slightly sweet, but I’ve gotten used to that.
The IKEA listing says it goes with salmon, crab, shrimp, marinated meats, ham and as a salad dressing. Maybe the idea of a warm potato salad would be good. I’d advise using it in modest amounts until you find what you like.
The best use of it I found was with a Swedish Christmas ham which is finished not with a sweet glaze like we do in the US but with a coating of egg, mustard and bread crumbs. I also like it, in a modest amount, with Prinskorv, the diminutive sausages, like mini-hot dogs, pork, which are fried in butter. I never tried it but I think it might similarly work with Falukorv, which is basically what we in the US call ring bologna.