Plum Jam For plum jam, use all the reject plums. The ones the soft squishy ones make perfect plum jam! What we used was similar to last week so it makes it easier for you all: 1 1/2 kgs of plums 1 1/2 cups of sugar There was enough fruit juice from the pulped fruit to cover the bottom of the pot which is necessary TIP: 1 cup of fruit = 3/4 cup of sugar Hot fruit, hot jars, and hot lids. Ensure that the lids suck in for thats the tell-tale sign that the jam is sealed. Might have to make a bread t