Orange

When it an orange not an orange? When it’s a grapefruit. A couple of grapefruit were delivered in the weekly fruit and veg box but we didn’t realise they were not oranges and they ended up in a whole orange cake. Clearly, it didn’t taste as we had imagined but it turned out to be really delicious and surprisingly it was not as bitter as you might have thought. What to do with the other one?