Guayaba, nice fruits on your Sweetheart and Mauritius trees !
I was lucky enough to taste some Sweetheart fruits this year from Boxturtle and they were excellent. His fruits are all large like the photo he shows, chicken tongue seeds, and very sweet.
He was nice enough to share many cuttings from his Sweetheart tree so I'm now converting my large Brewster tree so next year I hope to have 1/3 of my tree branches with Sweetheart. I will eventually convert 1/2 of the tree to Sweetheart in the next few years. The other half of the tree will be multi-grafted with all the other good varieties everyone talks about (Mauritius, Emperor, Kaimana, NMZ, Heung Lai). Even though I love Longans also, the Lychees seems to have more flesh to eat so I like my multi-grafted tree.