INGREDIENTS
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Ingredients:
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3/4 stick unsalted butter, divided
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1 cup fine dry bread crumbs
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1/4 lb Gruyere, finely grated (2 cups) (I used swiss cheese)
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1/2 cup finely grated Parmigiano-Reggiano
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2 tsp finely chopped garlic
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1 tbsp finely chopped flat-leaf parsley (I used dried parsley, same amount though)
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3 lbs leeks, root ends trimmed (I only had 2 leeks so I am not sure this was enough?)
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2 tbsp all-purpose flour
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1 1/2 cups chicken or vegetable stock
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1/8 tsp nutmeg
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1/2 tsp grated lemon zest (I used the zest of a whole lemon)
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1 lb cremini mushrooms, trimmed and thinly sliced (2 - 8oz packages)
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Equipment: a 1 1/2 quart oval gratin or other shallow baking dish