Steps
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1. Heat a large saucepan on medium heat, add in oil
2. Peel and slice finely the white onions, add into pan and cook gently.
3. Zest the oranges, add along with the cardamon and sugar into saucepan, stir regularly to avoid burning or sticking.
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4. Juice the oranges (roughly 200ml) strain off any seeds, pour into saucepan, and bring to the boil
5. Add in mandarin syrup, continue to boil, and reduce until no liquid remains, and the marmalade is thick.
6. Spoon into a prepared Kilner Jar and store for up to 1 month in the fridge. Serve with figs and manchego cheese and freshly baked bread