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Grind the saffron and pinches of sugar and salt in a mortar and pestle.
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Transfer to a small bowl and add the hot water.
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Let the saffron sit or bloom for 30 minutes.
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Drain the sauerkraut, squeezing as much water as you can out of it.
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Heat the oil in a skillet and add the onions.
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Sauté until transparent.
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Combine the sauerkraut with the onions.
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Mix in the wine, then the bloomed saffron.
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Season with sugar, salt, and pepper.
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Sprinkle the chopped rosemary on top and cook for another 3 minutes.
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Remove from heat, transfer to a serving dish.
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Garnish with extra rosemary and serve.