Cut up chicken, place in pot, cover with water. Add salt and onion. Cook until it boils, turn down and simmer until tender (about an hour). Remove chicken and leave a little water on it.
Beat eggs with fork, add salt and flour a little at a time until you can't stir it.
Throw dough out on floured board. Knead. Roll to 1/8" thick. Cut long thin strips.
Make sure chicken soup is boiling then add noodles - one at a time (so they don't stick). Add all noodles and keep barely boiling for about an hour. Remove bones from chicken. When noodles are finished, add deboned chicken to soup and serve.