the so called soupe au pistou recipe linked to here is nothing like a real soupe au pistou... I don't know the food network tv chef she copied the recipe from, but it's not authentic in any case. (bacon? tomato paste? peas?)

i live in the south of france, and soupe au pistou is a delicious summer soup, made with summer vegetables from the "potager" (the kitchen garden). the 7 vegetables are:
onions
carrots
potatoes
white beans (fresh cranberry/borlotti beans are traditional, white haricots cocos work too)
green beans
zucchini
peeled, seeded tomatoes (added shortly before serving)

some people add small pasta to it, but i prefer it without.

it's also common to sprinkle your bowl of soup with fresh parmesan.
heartily recommended when properly prepared. bon appétit!