You can use any citrus fruit in this recipe - lemons, oranges, mandarins, tangerines, pomelos, grapefruit, limes, kumquats - or combinations of citrus. The alcohol is optional...
If the jars are properly sterilised and sealed, the marmalade will keep for at least 12 months. Once opened, keep the marmalade in the fridge and use within 3 months.
Ingredients:
1 kg citrus fruit
1 litre water
600g sugar
1/4 cup of Cointreau or other liqueur that would go well with citrus
Method:
Finely peel the fruit making sure that you don't include the pith (the white bit under the skin) and slice thinly - add to a large boiler
remove the pith from the fruit and discard
chop the fruit, setting the seeds aside
add the chopped fruit to the skin in the boiler
tie the seeds into a piece of muslin and add to the boiler along with the water
bring to the boil then simmer uncovered for about 1 hour until the skins are soft - you may need to add a little more water
remove and discard the bag of seeds
add the sugar and liqueur and return to the boil
continue boiling until the marmalade sets when tested (105 degrees C)
sterilise some jam jars
allow the marmalade to cool for about 5 minutes and remove any scum from the surface
bottle and seal
Tips:
Add 1/2 to 1 cup finely chopped crystallised ginger to the fruit in the first stage if you like ginger.