Norddeutscher Aaleintopf

Aaleintopf belongs to the north, to river mouths, canals, and coastal kitchens where eel once came home in the net and the pot had to feed the table. This is not a thin soup. It is an Eintopf, one pot with potatoes, roots, herbs, and fish enough to make a meal, sharpened with vinegar because the northern palate knows sweet and sour better than people give it credit for.

Hamburg will argue from its Aalsuppe, with dried fruit and herbs and sometimes eel, sometimes a joke about allens, everything, going into the pot. Schleswig-Holstein keeps it plainer, more eel and vegetable, less fruit. I cook this one as a north German stew: clean broth, potatoes that hold their corners, a little prune for depth, vinegar at the end. Im Norden anders, im Süden anders. The south has its dumplings and roasts; the north has fish, rye, sourness, and sense.

The technique that decides it is simple: don't boil the eel. Build the broth first from vegetables, peelings, herbs, and the eel bones if you have them, then put the eel pieces in late and let them tremble below a hard boil. A rolling boil tears the flesh and drives the fat into the liquid, and then you have a cloudy pot that tastes tired before it reaches the table.

Taste at the end, not at the beginning. Vinegar, sugar, salt, and a knob of butter go in when the potatoes are tender and the fish is done, because the sharpness cooks dull if you spend it too early. Weggeworfen wird nichts: the parsley stems, leek greens, peelings, and bones make the broth. Nicht aus dem Glas.