Wash the tangerines and lemon well. Cut in four and then in slices. Remove the seeds and put the fruit in a large bowl. Add water and cover with a plastic membrane. Let the mixture rest for at least a day. The next day empty the mixture into a pot and simmer for about an hour and twenty minutes. Add the sugar and stir until it melts and continue to boil until reaching 104 C (about 1hour and 20 minutes).