This section is from the book "The Epicurean", by Charles Ranhofer. Also available from Amazon: The Epicurean, a Complete Treatise of Analytical and Practical Studies on the Culinary Art.
Prepare a quarter of a pound of well chopped fat pork, a small bunch of parsley chopped not too fine, four ounces of chopped onions, one and a half quarts of potatoes cut in seven-sixteenth of an inch squares; two quarts of clams retaining all the juice possible; one quart of tomatoes peeled, pressed and cut in half inch squares. Put the fat pork into a saucepan, and when fried, add the onions to fry for one minute, then the potatoes, the clams and the tomatoes; should there not be sufficient moistening, pour in a little water and boil the whole until the potatoes are well done Add five pilot crackers broken up into very small bits; one soup spoonful of thyme leaves, two ounces of butter, a very little pepper and salt to taste. This quantity will make four gallons, sufficient for sixty persons.
Chop up a quarter of a pound of fat pork, melt it down, adding four ounces of onions cut in quarter inch dice, and fry them with the pork, without coloring, then add one and a half pounds of potatoes cut in half inch squares, a pound of peeled and halved tomatoes, pressed out and cut in five-eighth inch squares, one ounce of coarsely chopped parsley, seventy-five medium sized clams, removing the hard parts and chopping them up very fine, the clam juice, a little salt if found necessary, pepper and thyme leaves. Boil the whole till the potatoes are cooked the green part of celery chopped fine) and should the clam juice not be sufficient, then add a little water.
 
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