Preheat the oven to 375 degrees F. Lightly grease a 9 by 13-inch casserole dish and set aside.
In a large skillet over medium-high heat, heat 1/4 cup of the oil. Add the eggplant in batches, seasoning on both sides with salt and pepper, and cook until golden, adding more oil as needed. Transfer to a plate as they cook, and set aside.
Heat 2 tablespoons of the remaining olive oil in a large skillet over medium-high heat. When hot but not smoking, add the onion and sausage, and cook, stirring, until the sausage is browned and the onion is soft, about 6 minutes. Add the tomato paste and cook, stirring frequently, until it begins to brown, about 1 to 2 minutes. Add the tomatoes, their juices, the Italian seasoning, black olives, 1 teaspoon of salt, and the crushed red pepper. Reduce the heat to medium-low and gently simmer, uncovered, until the flavors marry and the sauce slightly thickens, about 20 minutes. Remove from the heat. Add the basil and adjust seasoning, to taste.
Meanwhile, melt the butter in a medium saucepan over medium-high heat. Stir in the flour and cook, stirring constantly, until thickened and forms a light roux, about 2 minutes. Whisk in the milk and, whisking frequently, cook until the sauce is thickened and smooth, about 4 minutes. Remove from the heat and season with the nutmeg and salt and pepper, to taste.
Arrange half of the eggplant slices on the bottom of the casserole, overlapping as necessary. Top with half of the cooked pasta, then half of the sausage-tomato sauce. Place another layer of eggplant slices on top of the sauce, then layers of pasta and sausage-tomato sauce. Pour on the white sauce, then top with the grated mozzarella and Parmesan.
Bake for 1 hour, or until puffed and golden brown on top.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	566.91 Kcal (2374 kJ)
Calories from fat	394.25 Kcal
		% Daily Value*
Total Fat	43.81g	67%
Cholesterol	67.62mg	23%
Sodium	1046.92mg	44%
Potassium	488.67mg	10%
Total Carbs	23.74g	8%
Sugars	6.59g	26%
Dietary Fiber	3.97g	16%
Protein	20.08g	40%
Vitamin C	4.1mg	7%
Vitamin A	0.1mg	2%
Iron	1.1mg	6%
Calcium	326.6mg	33%

Amount Per 100 g
Calories	197.88 Kcal (828 kJ)
Calories from fat	137.61 Kcal
		% Daily Value*
Total Fat	15.29g	67%
Cholesterol	23.6mg	23%
Sodium	365.43mg	44%
Potassium	170.57mg	10%
Total Carbs	8.29g	8%
Sugars	2.3g	26%
Dietary Fiber	1.38g	16%
Protein	7.01g	40%
Vitamin C	1.4mg	7%
Iron	0.4mg	6%
Calcium	114mg	33%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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