I made this recipe last summer after I saw the colourful summer tomatoes. I love papaya and find it a great ingredient. My wife likes mango more (I try not to fault her on that) and this salad works with mango as well. While pretty much all tomatoes are available year round, I find the fresh, summer grown tomatoes are key for the full flavour. Smell your tomatoes! If they don't smell like a tomato, they ain't going to taste like one.