They're called fifteens because you use 15 of each of the main ingredients. Traditionally this also includes glacé cherries but I tend to miss them out - there's already more than enough teeth aching sweetness in this recipe without them.
You will need (makes approximately 20 slices):
- 15 large marshmallows
- 15 digestive biscuits
- 15 glacé cherries, halved (optional)
- 397g tin of condensed milk
- 1 cup sweetened flaked coconuts
- Put your digestive biscuits into a freezer bag and use a rolling pin to crush them as finely as possible.
- Cut your marshmallows into quarters (or you could use mini marshmallows instead) and put them with the crushed digestives in a large bowl. If you've decided to use the glacé cherries, add them in too.
- Gradually pour in the condensed milk and mix the ingredients together until they become a soft, moist dough.
- Get a large sheet of baking paper. It needs to be about double the width of your baking tray. Put it onto the tray and cover the paper with a layer of the flaked coconut.
- Transfer your dough onto the paper and shape into a long rectangle, roughly one inch thick. The marshmallows will stick out and make it look a bit odd but trust me, it'll taste good.
- Cover the top of the dough with the rest of your coconut.
- Wrap the dough up with the paper and leave them in your fridge for at least 3 hours. It works best if you're able to leave them overnight.
- Once hardened, slice up the log into small slices and serve with coffee: fifteens make for perfect elevenses.