Fish in Horseradish Sauce

This dish has roots in Polish and Eastern European holiday tables, where chilled fish under a sharp horseradish blanket is a non-negotiable course on Christmas Eve and Easter spreads. Carp is the traditional choice, though sole, pike, or any firm white fish does the job beautifully.

The technique is simple but matters in the order. First, you build a quick aromatic vegetable stock with carrots, celery, parsley root, and onion. The fish poaches gently in that strained liquid for just 6 to 10 minutes, then gets chilled. Three-quarters of a cup of the same poaching stock becomes the base for the sauce, so the fish flavor runs through the whole dish, not just the protein.

The horseradish sauce starts as a classic roux: butter melted with flour, then gradually whisked with the warm stock until thick and glossy. Sour cream and prepared horseradish go in off the heat so they stay fresh and sharp. Sieved hard-boiled eggs scattered on top add richness and a soft yellow contrast against the pale sauce.

Chef Tips

• Don’t overcook the fish. The minute it flakes easily, pull it out. It firms up further as it chills.
• Cool the sauce 15 minutes before pouring so it doesn’t warm the fish back up.
• Use cream-style prepared horseradish for the smoothest texture. Whole grated horseradish works but gives a coarser finish.
• Serve with cold boiled potatoes, dark rye bread, and a glass of dry white wine.

Variations

• Replace half the horseradish with Dijon mustard for a milder, French-leaning sauce.
• Garnish with chopped fresh dill and a sprinkle of capers for a Scandinavian flavor.
• Use cooked salmon instead of white fish for a richer, pinker version.