All You MAY 2013
1. Preheat oven to 400°F. Make filling: In a skillet over medium-high heat, sauté beef, onion, garlic and mushrooms until beef is no longer pink, 7 minutes. Transfer mixture to a bowl. Stir in spinach, Worcestershire, mustard and cheese. Season with salt and pepper. Set aside.
2. Make topping: Melt butter in a pan over medium heat. Sprinkle in flour and cook, stirring, until pale golden, about 2 minutes. Whisk in milk; bring to a boil, whisking. Cook and whisk until thick and smooth, about 2 minutes. Whisk in Parmesan; season with salt.
3. Lightly beat yolks in a bowl. Slowly whisk in half of sauce. Pour into pan, whisking. Whisk over medium-low heat until thick, about 2 minutes. Transfer to a bowl.
4. Line a baking sheet with foil; place shell in center. Stir 3 eggs into meat mixture; spread in shell. Spread topping over mixture. Bake until top is puffed and brown, about 35 minutes. Let rest 10 minutes.
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