we had a glut of strawberries the other weekend (over-enthusiastic pick-your-owning), and I made jam from a recipe my mum used to use that involves no boiling or testing for setness etc and hence is dead easy.
Original (for strawberries) is \link{http://www.certo.co.uk/Recipes/Freezer/Strawberry%20Freezer%20Jam.htm\here} but I can't find a decent UK version for cherries - if you fancy it, their Jam Advisor is [email protected]