Master Canning and Become a Preserver 1of 13. (Canning is a technique that can intimidate even the experienced cook. Here, we show you basic canning techniques, using a plum jam recipe. However, the same methods can be used for preserving many other fruits and some vegetables). Go to website for complete instructions on what is needed and how to make Plum Jam, only 4 ingredients: plums, sugar, lemon juice and salt.