Shell what quantity you please of young peas; put them in the pot when the water boils; let them have four or five warms; then first pour them into a colander, and then spread a cloth on a table, and put them on that, and dry them well in it: have bottles ready dry'd, and fill them to the necks, and pour over them melted mutton-fat, and cork them down very close, that no air come to them: set them in your cellar, and when you use them, put them into boiling water, with a spoonful of fine sugar, and a good piece of butter: and when they are enough, drain and butter them.
Source:
Old Cookery Books and Ancient Cuisine