Preparation Melt butter in heavy large skillet over medium heat. Add sliced onion and sauté until very tender and beginning to color, about 10 minutes. Add herbs and sauté 1 minute. Add whipping cream and vodka and simmer until sauce thickens slightly, about 8 minutes. Add pasta and cheese and toss until sauce coats pasta. Season to taste with salt and pepper and serve.
Preparation Melt butter in heavy large skillet over medium heat. Add sliced onion and sauté until very tender and beginning to color, about 10 minutes. Add herbs and sauté 1 minute. Add whipping cream and vodka and simmer until sauce thickens slightly, about 8 minutes. Add pasta and cheese and toss until sauce coats pasta. Season to taste with salt and pepper and serve.