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1
Bring a medium saucepan of water to a boil.
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2
Stir in the brown and wild rices, cover and cook over low heat, stirring occasionally, until tender, about 45 minutes.
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3
Drain and transfer to a large bowl.
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4
Meanwhile, bring a large saucepan of water to a boil, add the cabbage, cored side down, and cook over moderately high heat until the outer leaves begin to loosen, about 10 minutes.
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5
Using tongs, carefully peel 8 outer leaves from the head of cabbage as they become loose.
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6
Reserve the remaining cabbage for another use.
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7
Cut each of the 8 leaves in half and discard the thick center rib.
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8
In a medium bowl, blend the yogurt and garlic; season with salt and pepper.
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9
Melt the butter in a large skillet.
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10
Add the mushrooms and lemon juice; season with salt.
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11
Cook over moderate heat until the mushrooms are tender and their liquid has evaporated, about 6 minutes.
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12
Add the shallots and cook, stirring, until softened, about 4 minutes.
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13
Add the mushrooms to the rice.
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14
Stir in 1 tablespoon of the dill and 1/2 cup of the yogurt sauce; season with salt and pepper.
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15
Add the tomatoes to the skillet and cook over moderately high heat until their liquid has evaporated, about 5 minutes.
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16
Stir in the tomato paste and season with salt and pepper.
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17
Preheat the oven to 375.
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18
Spread a cabbage leaf on a work surface with the cut side facing you.
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19
Place 1/4 cup of the rice filling within 1/2 inch of the edge.
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20
Roll the leaf over the filling, tucking in the sides as you roll, to form a neat package.
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21
Repeat with the remaining leaves and filling.
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22
Spoon half of the tomato sauce into a shallow 10-by-14-inch glass baking dish.
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23
Add 1/4 cup of water, arrange the rolls in the baking dish, seam side down.
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24
Spoon the remaining tomato sauce over the rolls and cover with foil.
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25
Bake the cabbage rolls for 45 minutes, or until the sauce is bubbling and the rolls are hot throughout.
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26
Transfer the cabbage rolls to plates.
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27
Spoon the remaining 1 1/2 cups of yogurt sauce over the rolls.
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28
Sprinkle with the walnuts and the remaining 1 tablespoon of dill and serve.