i am definitely using star fruit instead of apples for ROSE’S heavenly CAKES: Apple Caramel Charlotte (page 215).  here is what poached star fruit looks like.

1- prior poaching:

2- after poaching and completely cooled:

3- i am using the same recipe, except replacing apple with star fruit, by weight.  instead of calvados, i am using williams.  and for fresh lemon juice, i am using fresh kona lemon juice:

4- and on the subject of my grandpa introducing star fruit to my family, i bumped into this old family photo.  my baby brother and his 7th cake in Peru:

5- and why not, here a new documentary about food in Peru.  highly recommended: