In a large skillet, melt together 2 tablespoons butter and the sage. Cook, stirring occasionally, until the butter is browning and the sage is crisp, 4 minutes. Remove the sage leaves from the butter and set aside.To the skillet, add the olive oil, shallot, garlic, and oregano. Cook until the shallots begin to caramelize, about 5 minutes. Reduce the heat to low, add the tomato paste, pumpkin, and red pepper flakes, cook 4-5 minutes, until thickened. Stir in the vodka, cook another 2 minutes. Stir in the cream, 1 tablespoon butter, and the parmesan. Season with salt and pepper. Keep warm over low heat.Bring a large pot of salted water to a boil. Add the tortellini and cook according to package directions until al dente. Just before draining, remove 1 cup of the pasta cooking water. Drain.Add the tortellini to the vodka sauce, tossing to coat. If needed, thin the sauce with pasta cooking water.Divide the tortellini among plates and top with crispy sage and parmesan. Enjoy!