Step 1
Cut the lemons in half. Juice the lemons, reserving the seeds. (You will need ¾ cup lemon juice for this recipe).
Step 2
Place the lemon juice, reserved seeds, plum, nectarine, apple and 8 cups (2L) water in a large saucepan. Place over high heat and bring to the boil. Reduce heat to low and cook, stirring occasionally, for 1 hour.
Step 3
Line a large colander with 2 large pieces of muslin or clean kitchen wipes. Place over a large bowl. Spoon the plum mixture into the colander. Set aside for 6 hours to drain.
Step 4
Place liquid in a saucepan. Add the sugar and rosemary. Place over low heat. Cook, stirring, for 5 mins or until sugar completely dissolves. Increase heat to medium-high and bring to the boil. Reduce heat to medium and cook, skimming the surface occasionally of any scum that rises to the top, for 1 hour or until jelly reaches setting point (or 105°C on a sugar thermometer).
Step 5
Remove from heat and set aside for 5 mins to cool slightly. Pour evenly among sterilised jars. Seal and turn upside down for 2 mins. Turn upright. Set aside to cool completely.
Remove from heat and set aside for 5 mins to cool slightly. Pour evenly among sterilised jars. Seal and turn upside down for 2 mins. Turn upright. Set aside tocool completely.
Serve with: roasted meats or with a cheese platter.