From the LA Times, this salad is a taste of summer. Tomatoes from the garden or the farm market and ricotta you make yourself--yum! The directions look long--but it's really simple and you can take a shortcut and buy your ricotta, but do try making your own--it's really luscious. Prep time does not include time to cool the homemade ricotta. Note: If you have 'ordinary' balsamico, you can simmer it over medium low heat, uncovered, for a few minutes and thicken it slightly--it will taste much richer.