"Also known as 'mosterdsoep.'..."
INGREDIENTS
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1/2 lb cubed bacon or pancetta
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1-2 tablespoons unsalted butter, if needed
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1 large white onion, chopped
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2 leeks, trimmed and chopped
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2 cloves garlic, minced
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3 tablespoons stoneground mustard
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3 cups vegetable or chicken stock
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1 cup heavy cream or half-and-half
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1 tablespoon cornstarch (optional)
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Kosher salt and freshly ground pepper, to taste