1.Preheat The Oven Broiler. Place The Roast In A Roasting Pan, Brush With Olive Oil, Sprinkle With Thyme Leaves, And Season With Salt And Pepper. Place Under The Broiler For 10 Minutes, Until Lightly Browned In Several Places. 2.Place 2 Pounds Sauerkraut In A Slow Cooker. Arrange Kielbasa Pieces Around The Edges Of The Slow Cooker Pot, And Place The Roast In The Center. Cover With Remaining Sauerkraut. 3.Cover Slow Cooker, And Cook Roast 6 Hours On High.