The following link is to a 1919 Jewish Cookbook complete with rules for kashering:
http://digital.lib.msu.edu/projects/cookbooks/books/internationaljewish/jewi.html
I hope you find this as informative as I did.
bw
From the 1919 Jewish cookbook:
TOMATO SOUP
Take a large soup bone or two pounds of soup meat, the latter preferred, one or two onions, a few potatoes, a few carrots, a turnip, soup greens and a can of tomatoes or a quart of fresh ones, cook two hours, and in season add two ears of sweet corn grated. Season with salt and pepper. Thicken with a tablespoon of flour, dissolved in cold water. A nice addition to this soup is a handful of noodles cut into round disks with a thimble.