This section is from the book "The Boston Cooking-School Cook Book", by Fannie Merritt Farmer. Also available from Amazon: Original 1896 Boston Cooking-School Cook Book.
JELLIES are made of cooked fruit juice and sugar, in nearly all cases the proportions being equal. Where failures occur, they may usually be traced to the use of too ripe fruit.
To Prepare Glasses for Jelly. Wash glasses and put in a kettle of cold water; place on range, and heat water gradually to boiling-point. Remove glasses, and drain. Place glasses while filling on a cloth wrung out of hot water.
To Cover Jelly Glasses. Cut letter paper in circular pieces just to fit in top of glasses. Dip in brandy, and cover jelly. Put on tin covers or circular pieces of paper cut larger than the glasses, and fastened securely over the edge with mucilage. Some prefer to cover jelly with melted paraffine than to adjust covers.
To Make a Jelly Bag. Fold two opposite corners of a piece of cotton and wool flannel three-fourths yard long. Sew up in the form of a cornucopia, rounding at the end. Fell the seam to make more secure. Bind the top with tape, and furnish with two or three heavy loops by which it may be hung.
Wipe apples, remove stem and blossom ends, and cut in quarters. Put in a granite or porcelain-lined preserving kettle, and add cold water to come nearly to top of apples. Cover, and cook slowly until apples are soft; mash, and drain through a coarse sieve. Avoid squeezing apples, which makes jelly cloudy. Then allow juice to drip through a double thickness of cheese-cloth or a jelly bag. Boil twenty minutes, and add an equal quantity of heated sugar; boil five minutes, skim, and turn in glasses. Put in a sunny window, and let stand twenty-four hours. Cover, and keep in a cool, dry place. Porter apples make a delicious flavored jelly. If apples are pared, a much lighter jelly may be made. Gravenstein apples make a very spicy jelly.
To Heat Sugar. Put in a granite dish, place in oven, leaving oven door ajar, and stir occasionally.
Follow recipe for Apple Jelly, using quinces in place of apples, and removing seeds from fruit. Quince parings are often used for jelly, the better part of the fruit being used for canning.
Follow recipe for Apple Jelly, leaving apples whole instead of cutting in quarters.
Currants are in the best condition for making jelly between June twenty-eighth and July third, and should not be picked directly after a rain. Cherry currants make the best jelly. Equal proportions of red and white currants are considered desirable, and make a lighter colored jelly.
Pick over currants, but do not remove stems; wash and drain. Mash a few in the bottom of a preserving kettle, using a wooden potato masher; so continue until berries are used. Cook slowly until currants look white. Strain through a coarse strainer, then allow juice to drop through a double thickness of cheese-cloth or a jelly bag. Measure, bring to boiling-point, and boil five minutes; add an equal measure of heated sugar, boil three minutes, skim, and pour into glasses. Place in a sunny window, and let stand twenty-four hours. Cover, and keep in a cool, dry place.
Follow recipe for Currant Jelly, using equal parts of currants and raspberries.
Blackberry Jelly Follow recipe for Currant Jelly, using blackberries in place of currants.
Follow recipe for Currant Jelly, using raspberries in place of currants. Raspberry Jelly is the most critical to make, and should not be attempted if fruit is thoroughly ripe, or if it has been long picked.
Barberry Jelly is firmer and of better color if made from fruit picked before the frost comes, while some of the berries are still green. Make same as Currant Jelly, allowing one cup water to one peck barberries.
Grape Jelly Grapes should be picked over, washed, and stems removed before putting into a preserving kettle. Heat to boiling-point, mash, and boil thirty minutes; then proceed as for Currant Jelly. Wild grapes make the best jelly.
Grapes should be picked when just beginning to turn. Make same as Grape Jelly.
1 peck wild grapes 1 quart vinegar
1/4 cup each
6 pounds sugar
Put first four ingredients into a preserving kettle, heat slowly to the boiling-point, and cook until grapes are soft. Strain through a double thickness of cheese-cloth or a jelly bag, and boil liquid twenty minutes; then add sugar heated, and boil five minutes. Turn into glasses.
Damson Jelly Wipe and pick over damsons; then prick several times with a large pin. Make same as Currant Jelly, using three-fourths as much sugar as fruit juice,
 
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