3/4 ounces dried porcini mushrooms (1 cup)
6 cups tepid water plus 2 cups hot water, divided
1 medium onion, finely chopped
1/2 stick unsalted butter
2 celery ribs, finely chopped
1 medium carrot, finely chopped
3 garlic cloves, finely chopped
1 1/2 pounds white mushrooms, sliced or quartered
1 (15-ounce) can diced tomatoes, drained
2 tablespoons finely chopped flat-leaf parsley
2 tablespoons finely chopped dill

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