How do I prevent tomatoes from falling in a green salad? When making a green salad, I have taken to grating carrots instead of dicing them so they will mix better with the leaves.

I can't grate tomatoes. No matter how small I dice them (short of pureeing) they always precipitate out and fall to the bottom of the bowl.

How can I prepare the tomatoes or the salad to keep them mixed?
I work around this by serving tomatoes on the top of the individual salads after they've been portioned out.  I'm not sure of a way to keep them incorporated.