Semmelkren

Gretel always said you can judge an Austrian cook by three things: her broth, her Knödel, and her Semmelkren. The broth tells you about patience. The Knödel tell you about hands. The Semmelkren tells you about timing, because everything depends on when the horseradish goes in.

Semmelkren is the sauce that sits next to Tafelspitz at every proper Viennese table. The name tells you exactly what it is: Semmel, the Austrian word for a white bread roll, and Kren, horseradish. You take stale rolls, soak them in hot beef broth until they fall apart, mash the whole thing smooth, and stir in a pile of freshly grated horseradish at the very end. The bread gives it body. The broth gives it flavor. The horseradish gives it a sharp, sinus-clearing warmth that cuts straight through the richness of boiled beef.

The technique is simple, but the one rule you cannot break is this: never boil it once the Kren goes in. Heat kills horseradish. The volatile oils that give it that beautiful, eye-watering bite evaporate if you let the sauce bubble. You take the pan off the heat, stir in the freshly grated root, and serve it warm. That's the whole secret. In my grandmother Eva's kitchen, I watched Gretel make this faster than most people can find a recipe. A handful of stale bread, a ladleful of broth, a knuckle of horseradish from the fridge. Ten minutes and it was on the table, sharp and thick and exactly right.

This is good Austrian home cooking at its most honest. Four or five ingredients, no fuss, nothing to hide behind. If your broth is good and your horseradish is fresh, Semmelkren will be extraordinary. If either one is poor, there's nowhere for it to go.