can I used canned tomatoes?

As Amanda said, definitely also try it with fresh tomatoes at their peak, but either way, it's delicious.

Hi there -- sorry for the delay, just seeing this. I wouldn't use canned tomatoes. I don't think they'll have enough charm. Wait until next summer, alas!

I'll bet Amanda will offer her input, but until then, I often roast canned tomatoes to make this and other tomato soups off season. Drain them well, cut in half and follow the roasting directions. They will caramelize around the cut edges. Save the liquid from the draining process of the tomatoes. You may want to add it to the soup.