We have always been disappointed in dragon fruit flavor. The red flesh ones seem to have more flavor than the white. It is used in cooking competitions for building stuff.
We used to get quite a bit of chayote, my usual market was heavily geared towards more Mexican style ingredients.
Today we went to the Farmer's Market and trying something new to us -- Kuri squash.
https://en.wikipedia.org/wiki/Red_kuri_squash
We also got some what should be hot jalapenos -- if they are large and smooth, they are milder (ie, I can handle them). For heat you want the ones with "stretch marks" from being stressed through the growing season. Hubby also got some fresh cayenne peppers.