Sure, I've done that many times, especially in the winter when tomatoes taste like crap.
Both, especially if there're good, fresh and free.
Psshh, who needs the bread! I'll eat the lettuce or tomatoe right out of the bag!
I don't like tomato on my sandwiches with the exception of a hamburger.
Sure, why not.
By this do you mean just put two pieces of bread together and eat it and that's ALL? With nothing in between? Okay sure, I will do that.