Seville orange, vanilla & cardamom marmalade

1 . Stage

Peel and finely chop 7 of the oranges, discarding the pips. Reserve the skin of 3, discarding the rest, and finely chop into fine strips. Halve the remaining orange, skin-on, and finely slice. Add this to the pan with the cardamom seeds and 400ml water. Add the vanilla seeds and throw in the pod.

2 . Stage

Boil for 10 mins until the skins are softening, then add the lemon juice and sugar, stirring constantly. Once the sugar has dissolved, simmer for 30-35 mins. Turn up the heat and boil to set (about 10-15 mins) – the boiling point of jam is 105C. If you don’t have a cooking thermometer, try the ‘wrinkle test’ – spoon some marmalade onto a cold saucer and leave for a minute. If it wrinkles when you poke it and has a fine skin on top, it’s ready to set. Pour the marmalade into sterilized jars, top with wax discs and lids, and store for up to a year.