Look for plump firm plums with no signs of wrinkled or split skin. Once ripe plums should yield slightly to gentle pressure. Until at this stage store in a single layer at room temperature. Once ripe store in a plastic bag in the fridge for 2 to 3 days. Simply wash plums gently in cold water. If using for cooking or to make jams and sauces halve and remove the stones first. The rich colour of their flesh makes them an attractive addition to recipes.