Wash the oranges and limes in hot water and rub dry vigorously. Peel the peel of 4 oranges and the limes thinly and cut into very fine strips. Halve the limes and all oranges and squeeze the juice.
Weigh the juice and cut peel (1000 g) and mix with jam sugar in a pot. Add cinnamon sticks and bring the fruit mass to the boil while stirring. Cook for 1 minute until bubbly. Add orange liqueur and remove the cinnamon sticks.
Fill orange marmalade hot into prepared glasses and close them immediately. Place the jars on the lid for 5 minutes.