This dish derives its name from the color contrast of the two types of pasta. Because it mixes the earthiness of whole wheat with the familiarity of regular pasta, it's a delicious introduction to whole-grain pastas. Truffle oil adds a pleasant, earthy undertone; you can substitute extravirgin olive oil. As with all alfredo dishes, serve immediately.
It's the dish everyone's expecting on the holidays, but it's so easy to make, you can serve it any day. What makes our green bean casserole so good? A secret ingredient - cream of mushroom soup.
