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Preheat oven to 400 degrees F.
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Place potatoes in a large sauce pan and cover with cold water.
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Place over high heat and bring to a boil.
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Lower heat slightly and continue to cook until potatoes are fork tender (if you use small potatoes, this should be about 10-15 minutes adjust the cooking time if you use bigger potatoes poke them with a fork to determine if they are tender).
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Drain and set aside.
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Meanwhile, in a medium to large skillet, melt butter over medium heat.
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Add onions and garlic, cook, stirring often.
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When onions start to soften add mushrooms and continue to cook just until mushrooms have softened.
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Remove from heat and set aside.
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Season steaks on both sides with olive oil, salt and Mrs.
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Dash.
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Sear in a hot skillet for about 3 to 4 minutes on each side.
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Steaks will be rare, but they will continue to cook in the oven.
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You are searing the steaks to develop the crust and flavor in the steaks.
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Remove steaks and set aside to rest for at least 5 minutes.
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Stir the Demi-Glace into the skillet that you seared the steaks in.
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Add 1/4 cup water, cook over medium heat, stirring until demi-glace is dissolved.
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Add half and half and steak sauce, continue to cook, stirring until sauce just starts to bubble.
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Remove from heat.
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Stir in 2 tablespoons of fresh parsley, as well as the onion, garlic and mushroom mixture.
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Set aside.
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Cut steaks into 1 inch chunks, reserve any juices from the steaks and pour it into the sauce mixture.
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Add steak and potatoes into the sauce stirring until well combined.
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Pour the mixture into a large casserole dish, I used my oval Corningware dish.
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Unfold puff pastry onto a lightly floured surface and roll out slightly so that it will cover the top of your casserole dish.
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Gently lay the pastry over filling, tucking the sides under.
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Using a sharp knife, make a few slits in the top of the pastry to allow steam to escape.
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Bake for 45 to 50 minutes or until puff pastry is puffed up, browned and filling starts to bubble.
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Allow to cool for 5 minutes before serving.
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Garnish with fresh parsley.
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Enjoy!
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Miss