Bring a large pot of water to a boil and add a generous pinch of salt. Cook the pasta according to package directions until al dente. Once done, drain the pasta and drizzle with a small amount of olive oil to prevent sticking.
While the pasta is cooking, gently heat the marinara, alfredo, and pesto sauces in separate saucepans. This keeps each sauce warm and ready for layering. If making homemade sauces, prepare them ahead so they’re ready to go when the pasta finishes.
Place the cooked pasta on a large serving platter. Spoon the marinara sauce over one-third of the pasta, the alfredo sauce over another third, and the pesto sauce over the remaining portion. Try to keep each section distinct so the colors show clearly — it’s what gives this dish its Christmas charm.
Just before serving, gently toss the sauces together in the center to create a beautiful swirl of red, white, and green. Top with freshly grated Parmesan cheese and a drizzle of olive oil for extra shine.