Ostpreußische Schmandsuppe

Ostpreußische Schmandsuppe belongs to the old eastern table, where a pot of broth, a few potatoes, a piece of bacon rind, and sour dairy could make supper without pretending to be poor. This is weeknight food when the stock is already in the house, and Sunday food when the bones were boiled after the roast. Weggeworfen wird nichts, the bone and rind do the work before anyone reaches for cream.

The regions split on sourness. East Prussia liked the tang of Schmand, soured cream, and often a little vinegar or cucumber brine in the pot; further south a cream soup tends to go milder, thicker, and more flour-bound. Im Norden anders, im Süden anders. This one should taste bright, not heavy, with potato for body and smoked bacon for the quiet background.

The whole dish is decided at the end. Beat Schmand with egg yolk, loosen it with hot broth, then stir it back off the boil. Boil it hard and the yolk tightens into threads while the Schmand splits into grains. Keep the heat gentle and it turns the broth satin-smooth. Erst verstehen, dann kochen.