Moussaka is one of those casseroles that asks a bit more of you and then justifies every minute. There are layers to make, yes, but they are deeply rewarding layers: eggplant softened until silky, a meat sauce seasoned with tomato and warm spice, and a bechamel that bakes into a golden cap. The finished dish lands somewhere between comfort food and occasion food, which is a very good place to be.
The crucial choice is keeping moisture under control. Roast the eggplant instead of letting it collapse in oil, reduce the meat sauce until it is thick and savory, and let the baked casserole rest before you cut into it. That patience is what gives you slices rather than a glorious but unruly spoonful.