Avocado-Peach-Tomato-Watermelon-Red Onion Salad

Make sure you get a good sweet red onion for this one, and homegrown or farmer's market tomatoes.  This is a summer recipe, because there's no other time of year you can get all these ingredients at their peak.  Serve this immediately after you prepare it.  The cold watermelon provides a wonderful temperature/texture contrast with the rest of the ingredients.

2 perfect avocados
3 peaches
2 tomatoes
2 cups cold watermelon
1/2 red onion

Juice of 1 juicy lime
Kosher salt

Cut into chunks the avocados, peaches, tomatoes, watermelon, and red onion.  Toss with the lime juice and a pinch of kosher salt.