What citrus fruit is this ?

Question

Dear Gardening person, I have been trying to find out for Years which fruit this is – with clearly FOUR fleshy sections – and have even written to the magazine twice, but have had no reply.

Can you please help me out of my misery ? Someone took this photo of what appears to be Real fruit, so it must exist and someone should know what it is.

Thank you for your help.

Answer 1

I can't think of a citrus fruit with only four sections.
Please post photos of the fruit and of the tree and we will try to identify.