Use the plate test to check the jam’s consistency. Before you begin cooking the jam, put a small plate in the freezer to get it very cold. At the suggested cooking time, remove the jam from the heat to stop cooking and place approximately 5 ml (1 teaspoon) of jam on the plate. Immediately place the plate back in the freezer for a few minutes. If the jam is not thick enough, cook for a few more minutes and repeat the test.