This section is from the book "The White Ribbon Cook Book", by Kathryn Armstrong. Also available from Amazon: The White Ribbon Cook Book.
One quart of brown mustard seed, 1 handful each of parsley, chervil, tarragon and burnet, 1 teaspoonful of celery seed, cloves, mace, garlic, salt to taste, enough vinegar to cover.
Put the whole into a basin with enough vinegar to cover the mixture. Let it steep 24 hours, then pound it in a marble mortar. When thoroughly pounded pass it through a fine sieve; add enough vinegar to make the mustard of the desired consistency, and put into jars for use.
 
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