Toast the flour in coconut oil until golden, then add milk, water, salt, and pepper, and stir. Let it cook for a bit.
Boil the pasta in salted water with a little olive oil and drain it before it's fully cooked.
Pour some of the béchamel sauce into a baking dish, add a layer of pasta with ground meat or your favorite vegetables, then top with another layer of béchamel.
Beat the egg with a little salt and pepper, pour it over the dish, and bake until the top is golden and crispy.