03Meanwhile, in a large pot of boiling salted water, cook cavatelli until al dente. Drain, reserving 1/3 cup cooking liquid.
04Transfer pasta to a large warmed serving bowl. Toss with remaining 1 tablespoon butter, the grated cheese and most of the reserved liquid. Toss well; add remaining cooking liquid if necessary to reach a creamy consistency. Stir in beet mixture. Season with salt and pepper. Dollop spoonfuls of seasoned ricotta on top of pasta and sprinkle with pistachios and cracked black pepper.