Tomato Tarts

I really didn't know what category to put this in because I have used these for a brunch or luncheon main dish, as a side, for entertaining and for vegetarian. I first tasted these at a place called Olga's Cup and Saucer in Providence, RI and I asked for the recipe. They scribbled down how they make it, but couldn't scale it down, so I did my best and I think this one's the winner. I use all my heirloom tomatoes at this time of year.