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1
Bake the eggplant: Preheat the oven to 475 degrees F. Brush the eggplant slices on both sides with the oil and lay on 2 small or 1 large foil-lined baking sheet.
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2
Season with salt and pepper.
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3
Cover with foil and bake until the eggplant is soft, about 25 minutes.
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4
Set aside covered.
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5
Make the meat sauce.
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6
Heat the olive oil in a large skillet over medium-high heat.
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7
Add the onion and cook, stirring with a wooden spoon, until lightly browned, about 4 minutes.
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8
Add the garlic and cook, stirring frequently, until fragrant, about 1 minute.
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9
Add the beef, oregano, allspice, cloves, and cinnamon.
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10
Break the meat up into small pieces and season with the 1/2 teaspoon salt and pepper to taste.
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11
Cook, stirring occasionally, for about 2 minutes.
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12
Lower the heat to medium and cook, stirring, until just cooked but still slightly pink inside, about 1 minute more.
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13
Add the tomato and bay leaf and bring to a simmer.
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14
Cover, and cook until the sauce is thickened and fragrant, about 20 minutes.
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15
Make the custard sauce.
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16
Melt the butter in a medium saucepan over medium heat.
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17
Whisk in the flour until smooth.
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18
Cook, stirring, for 1 minute.
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19
Remove the pan from the heat and add the milk, salt, and nutmeg.
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20
Return to the heat and while whisking constantly, bring to a boil.
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21
Simmer 2 minutes.
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22
Transfer the sauce to a bowl and stir to cool.
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23
When the sauce is cool, whisk in the egg and yolks.
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24
Assemble the moussaka.
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25
Lower the oven to 350 degrees F. Brush a 9 x 13 x 2-inch casserole dish with the oil.
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26
Scatter the breadcrumbs over the bottom of the pan.
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27
Lay half of the eggplant in the pan, overlapping the slices if needed.
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28
Cover with half of the meat sauce and smooth with a rubber spatula.
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29
Repeat with the remaining eggplant and meat sauce.
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30
Pour the custard sauce over the layered mixture and smooth with a rubber spatula.
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31
Sprinkle with the Pecorino Romano and bake, uncovered, until lightly browned and the custard is set, about 1 hour.
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32
Remove the moussaka from the oven and let rest for 10 minutes.
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33
Use a slotted spoon or spatula to serve.