My recommendation would be naranjilla.
The foliage is stunning and will become a talking point of your garden, i've grown them and have found them to enjoy warm, moist shaded conditions best so i think sun in winter, shade in summer would be fantastic. the fruits are small and i only got small crops but boy are they jam packed with sweet-tart goodness
Naranjilla - Solanum quitoense
cheers
dany
PS i grew them in newcastle, Australia (coastal)(don't know how that stacks up against your climate)