I know these are rare but there has to be someone out here with some experience or knowledge on this tree!

mine gave me one fruit this year. It was sweet, but not lemony, didn't really remind me of any particular flavor. I saved half in the fridge; when I ate it next day, it tasted a tiny bit like pine or turpentine.

How's your plants growing? What are you feeding them?

Osmocote every four months plus watering every couple weeks (sometimes three) with Miracle Grow water soluble and some fish emulsion. They seem to be growing fine but the one in constant full sun and daily drip irrigation is doing much better than the Rollinia by the side of the house that only gets water twice a week. I'm thinking they are very water hungry plants.

Your tree looks great though. I have one with the same nice green leaves and another that is dropping leaves and looking sick. The sick one is in the ground too -- go figure.