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Explanation: "Knollen" is a slang word for potatoes (in this part of Germany at any rate. I'm not 100% sure how widespread it is, but fairly, I believe.) but I suspect this means that the gypsum filling doesn't form lumps, a but like easy-mix custard or gravy.
David Williams Germany Local time: 06:42 Native speaker of: English PRO pts in category: 16