1.Pat The Pork Roast Dry With A Paper Towel And Perforate The Meat At 1 Inch Intervals With A Knife Or Fork. Insert Leaves Of Rosemary In The Perforations. 2.Place The Onion Halves Into A Glass 9 Or 10 Inch Pie Plate. Set The Meat On Top Of The Onions So They Act As A Roasting Rack. Pour The Water Over The Meat And Season With Salt, Pepper, Thyme, And Cumin. 3.Cook In The Microwave At Full Power For 16 Minutes (Or About 8 Minutes Per Pound). Turn The Roast Over And Cook For An Additional 6 Minutes Or Until The Internal Temperature Of The Roast Has Reached 160 Degrees F (70 Degrees C). Let The Roast Rest For About 15 Minutes Before Carving And Serving.