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1
Place mushrooms in large heatproof container, and add boiling water.
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2
Cover, and infuse 1 to 2 hours, or until mushrooms are tender.
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3
Strain infusion, and reserve infusion liquid.
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4
Coarsely chop mushrooms, and set aside in large bowl.
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5
Place onions, butter and sugar in large skillet, cover and sweat over medium heat 10 minutes, or until onions are soft and beginning to caramelize on bottoms.
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6
Add salt, and stir in flour to thicken.
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7
Place onions in bowl, and deglaze skillet with about 1 cup mushroom infusion, whisking well.
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8
Pour deglazing liquid into mushroom infusion.
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9
Preheat oven to 375F.
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10
Spray 2-quart casserole with nonstick cooking spray.
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11
Layer bread in casserole.
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12
Chop any remaining bread into small irregular pieces, and set aside.
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13
Combine mushrooms and tomatoes, and cover bread layer with mixture.
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14
Combine Gruyere cheese and sage, and scatter evenly over mushroom-tomato mixture.
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15
Cover with chopped bread.
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16
Spread onions over bread, and add mushroom infusion.
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17
Pat smooth with back of wooden spoon.
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18
Sprinkle sapsago cheese and caraway seeds, if using, over top.
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19
Bake uncovered 45 to 55 minutes, or until set and crispy on top.
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20
Serve hot directly from oven.