How to Make It
Cook pasta according to package directions; drain.
Meanwhile, melt butter in a large skillet over medium heat; add shallot, lemon zest, and garlic. Sauté 30 seconds. Stir in wine, lemon juice, and salt; cover skillet and simmer 2 minutes. Uncover skillet, and simmer 2 more minutes.
Whisk in cream in a slow, continuous stream. Whisk in crème fraîche and flour; cook, uncovered, 3 to 4 minutes or until mixture thickens slightly. Add edamame and half of cheese to pan; cook 5 minutes, stirring freqently. Add cooked pasta and remaining cheese, tossing to combine.
Remove from heat, and stir in arugula and tarragon. Sprinkle with black pepper.