1.Bring A Large Pot Of Lightly Salted Water To A Boil. Add The Pasta And Cook For 3 To 4 Minutes, Until Tender. Drain. 2.While You Wait For The Pasta, Combine The Tomatoes And Spinach In A Saucepan Over Medium Heat. When The Spinach Begins To Wilt, Stir In The Sour Cream And Pesto. Toss Sauce With Drained Pasta And Serve Immediately.