Merging bold, ripe strawberries and zesty jalapenos for a jar of Strawberry Jalapeno Jam of generous 20 oz is a masterpiece. It offers a delightful sweetness with a subtle hint of spice to finish. Taste this twist on classic Strawberry Jam. What is jam? Jam is a concoction of chopped or crushed whole fruits heated with water and sugar until it is sufficiently thickened, thanks to additional pectin. Then, they are stored in jars. Jam-making was a burgeoning industry in the 19th century. Here in the South, jams are popular and incorporated into a variety of dishes and recipes.