Chop or grind tomatoes, onions and peppers together and cover with the salt; let stand overnight. Drain, add the vinegar, spices (tied in cheese-cloth bag) and sugar; allow to boil slowly until tender (about 15 minutes). Add horseradish. Pack into sterilized Kerr jars to within inch of top. Put on cap, screw band FIRMLY TIGHT. Process in Boiling Water Bath 10 minutes.