For the pear puree, mix water and lemon juice. Peel the pears – they may be windfalls – cut the pears into wedges and remove the cores and bases.
Immediately turn the pear pieces in the lemon water to prevent them from turning brown. Tie the cloves and cinnamon in a small gauze bag (or use a tea ball) and add to the mixture with about half of the sugar.
Let stand covered for about 2 hours, this way additional juice will form. Bring the pear mixture to a boil, stirring constantly, and simmer until all the pears have broken down.
Then use a wooden spoon to make a trail in the pot, it should remain visible. When the puree is ready, remove the spice bag. Pour the pear puree into sterile jars or serve.