Prep 20 mins
Cook 30 mins
from Food Republik blog. You will need 8 1/2-pint Mason jars, sterilized. Note overnight timing.
- Slice the kumquats in half and remove the seeds and the tough white center membrane.
- Try to leave as much flesh as possible lining the peel.
- In a large heavy- bottomed pot, mix the kumquats, juice of ½ lemon, water and sugar. Bring to a boil, then reduce heat and simmer for about 15 minutes.
- The liquid should be syrupy. Cover and leave to steep overnight.
- The next day, bring the mixture back to a boil. Add the vanilla extract.
- Lower heat, and simmer for about an hour, stirring periodically and removing any foam with a spoon.
- Check the temperature regularly with a candy thermometer – when the mixture reaches 220 F, it’s ready.
- The marmalade will seem runny, but will thicken up quite a lot when it cools.
- To test whether it’s ready, chill a plate in the freezer for a few minutes.
- Place a few drops of the marmalade on the chilled plate. If the marmalade thickens to a jam-like consistency, it’s ready.
- Now you need to jar the jam.
- While the marmalade is simmering, bring another large pot of water to the boil.
- Boil the jars and their lids for about 10 minutes. Remove with a pair of tongs (also sterilized), and place on a clean kitchen towel.
- When the marmalade is ready, pour into the jars, leaving a little air at the top of the jar.
- Put the lids on and tighten. Place the closed jars upright into the pot of hot water, ensuring that water covers the lids.
- Boil for 10 minutes. Remove (carefully! They will be hot) and let cool.
- The seal at the top of the jars should be vacuumed down (they should not pop when you press on them).
- If the jars sealed correctly, the marmalade should keep without refrigeration for a year.