This section is from the book "Canning, Preserving And Pickling", by Marion Harris Neil. Also available from Amazon: Canning, Preserving And Pickling.
Rhubarb. Onions. 1 pint (2 cups) vinegar. 1 pint (2 cups) brown sugar. 1 teaspoonful salt. 1 teaspoonful ground ginger. 1 teaspoonful ground cinnamon. 1 teaspoonful ground cloves. 1 teaspoonful ground allspice. 1/2 teaspoonful grated nutmeg.
Wash some rhubarb, peel it if necessary, and cut it in pieces.
Measure five quarts and stew till soft in a little water, then add one cupful of chopped onions, vinegar, sugar, salt and spices.
Boil all together till fairly thick, stirring occasionally to prevent burning.
Put into jars and seal.
 
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