Ingredients
Equipment
Method
- Bring a large pot of well-salted water to a boil. Cook the penne 2 minutes short of al dente, around 8 minutes. Drain and set aside in the colander. Do not rinse.
- Heat the vegetable oil in a large skillet over medium heat. Add the chopped onion and cook until translucent, about 5 minutes. Add the garlic and cook 1 minute more until fragrant.
- Add the ground beef with 3/4 teaspoon of the salt, the black pepper and the chili powder. Break the meat apart with a wooden spoon and cook until no pink remains, about 5 minutes.
- Pour in the tomato puree, lower the heat to medium-low and simmer uncovered 10 minutes, until the sauce thickens and the oil separates at the edges. Taste and correct the salt. Set aside.
- Preheat the oven to 375 F and butter the baking dish.
- Make the bechamel. Melt the butter in a heavy saucepan over medium heat. Whisk in the flour and cook 2 minutes, whisking constantly, until it smells nutty but takes on no color.
- Pour in the cold milk in a steady stream while whisking hard. Cold milk into hot roux is what prevents lumps. Add the remaining 3/4 teaspoon salt and the grated nutmeg.
- Keep whisking over medium heat 8 to 10 minutes until the sauce coats the back of a spoon and holds a line when you draw a finger through it. Pull the pan off the heat.
- Whisk one ladle of the hot bechamel into the beaten egg to temper it, then pour that mixture back into the saucepan off the heat, whisking until smooth and glossy.
- Toss the drained penne with about one third of the bechamel until every tube is coated.
- Spread half the coated pasta across the bottom of the baking dish. Spoon the meat sauce over it in an even layer and scatter half the Rumi cheese across the meat.
- Top with the remaining pasta, level it with the back of a spoon, then pour the rest of the bechamel over the whole surface. Tilt the dish so it settles into the corners.
- Scatter the remaining Rumi cheese over the top.
- Bake 35 to 40 minutes, until the top is set, puffed at the edges and deep golden. If it is pale after 40 minutes, run it under the broiler for 2 minutes, watching closely.
- Rest 15 minutes before cutting. Serve hot, cut into squares straight from the dish.
