A new milling technique changed all that. The endosperm produces white flour, now available to everyone. It is widely believed that a doctor in St. Louis developed peanut butter in 1890 as a cheap, protein-rich food that his elderly patients without teeth could eat. George Bayle Jr., a merchant, ground the peanut butter for the mystery doctor and sold the surplus for 6 cents a pound. TO make jelly, you need sugar.
Sugar preserves the fruit, keeping it from spoiling.
To make sugar, you need sugar cane. Sugar cane probably first grew on an island in the Asian Pacific. Merchant sailors brought it west, and by AD 700, cane sugar was in the bakeries of Baghdad. By the late Middle Ages, the fruit spreads were popular across Europe. Books on jam-making appeared in the late 1600s.