Have fruit or berries left over that are about to turn bad? Cut them & freeze them (just pack them into a freezer bag or box & don't worry).
At a later point, get them out of the freezer, add them to a pot, heat & cook on low flame until turned into a lovely compote. No extra water or sugar necessary. I tend to always have apples as a basis, but otherwise is whatever I can find in the freezer.
Enjoy hot or lukewarm (warm up in microwave for a minute).