1 Prepare The Tomatoes First. Parboil The Tomatoes For One Minute In Boiling Water That Has Just Been Removed From The Burner. Drain. Using A Sharp Small Knife, Remove The Skins Of The Tomatoes. (If The Tomatoes Are Too Hot, You Can Protect Your Finger Tips By Rubbing Them With An Ice Cube Between Tomatoes.) Once The Tomatoes Are Peeled, Cut Them In Halves Or Quarters And Remove The Seeds And Juice From Their Centers. Also Cut Out And Discard The Stem Area. Why Use Plum Tomatoes Instead Of Regular Tomatoes? The Skins Are Much Thicker And There Are Fewer Seeds And Less Juice. 2 Make Sure There Is A Top Rack In Place In Your Oven. Turn On The Oven To 450