This is my most requested items when I'm coming to a potluck. It makes a beautiful presentation and has delicious sweet but light flavor. If I have enough time I sprinkle the fruit with some Splenda a few hours before prep time to sweeten them up some if needed.
Start with fresh roma tomatoes- this wonderfully rich taste from roasted ingredients has even been adopted by my friend (whose full-blooded Italian stepfather had been the best sauce maker before!). Easier than you'd think... mostly oven time while you wait for a timer to go off!