Step 1

Halve and juice the limes, reserving lime halves. Place the juice in a glass jug. Cover with plastic wrap and store in the fridge. Trim the narrow end from each reserved lime half. Place in a large bowl. Cover with warm water. Soak for 6 hours or overnight to soften. Drain.

Step 2

Cut each lime half into quarters and thinly slice into 2mm-thick strips. Place the lime strips, lime juice and cold water in a heavy-based saucepan. Bring to boil over medium-high heat. Reduce heat to low. Cover and simmer for 50 minutes to 1 hour or until rind is tender.

Step 3

Add the sugar and cook, stirring, for 10-15 minutes or until the sugar dissolves. Increase heat to medium-high. Boil, stirring often, using a metal spoon to remove any scum that rises to the surface, for 45-55 minutes or until marmalade jells when tested (see note). Spoon into sterilised jars. Store in a cool, dry place or the fridge once opened.