To prepare this delicious orange peel preserve recipe, first start by preparing the oranges. Using a vegetable grater, trim them a little bit on the outside then wash them thoroughly and place them in a large pan. Pour in enough water to cover the oranges completely.

Place the pan on high heat and bring to the boil. Boil for about 7 minutes, after the water starts to bubble, sinking the oranges in the water once in a while and turning them sides. Drain the oranges into a collander and cool them under cold running water. Rinse the pan with some water. Place the oranges back to the pan, and repeat the same procedure. You should repeat the boiling procedure 3 times, until the oranges have softened and most of the bitterness has been removed.

Place the oranges onto a cutting board and cut them into quarters and then cut each quarter into half (8 pieces each orange). Use scissors remove the pips and any leftover flesh from the inside of the orange (the white part).

Add 2 1/2 cups of water and 1kg sugar into a saucepan and boil for 5 minutes. Add the orange peel into the pan and boil for a further 15 minutes. While the oranges boil, skim any white foam that surfaces. Let rest for at least 8 hours or overnight.

The next day, remove the orange pieces and set aside. Boil the syrup until it thickens. Add lemon juice, glucose and vanilla extract and boil for 1 more minute. Add orange pieces back and continue boiling until syrup is very thick and glossy.

Let cool completely. Pour into sterilized glass jars and store in the refrigerator for 6-8 months.