An elderly woman had me help her make this dish. She liked keeping the peelings on the tomatoes & eating the next day. I liked keeping the peelings on & eating then & there. I found the peelings will slide off the tomato if refrigerated overnight. I wonder if this is idea to use saltines was due to someone reading about a bread salad & having just saltines around? I would love to give exact measurements but it so good winging it, that it really doesn't matter. Some people start with a whole sleeve of saltines, probably 1/8 cup of onion OR LESS. I make it just FOR ONE, when I want it.