Bring A Large Pot Of Lightly Salted Water To A Boil. Place Rotini Pasta In The Pot, Cook For 8 To 10 Minutes, Until Al Dente, And Drain. Heat The Olive Oil In A Skillet Over Medium-High Heat. Place Lima Beans In Skillet. Season With Garlic, Tarragon, And Salt. Cook And Stir Until Heated Through. Toss With Cooked Rotini And Top With Parmesan Cheese To Serve.