Fruits that are sweet on the outside and sour on the inside

Exploration Stage: Foggy Backstreet
From: Kira Woodville
Description: The designer's greatest weapon is his unique talent to transform the shape of an object simply by mindful thought. This may sound like a strange thing to ask, but... could you please take that mutated strawberry over there? I'd like to check it out.
Completed: It seems I was wrong in my prediction. It was the fog that mutated this strawberry, not the designer. I've been trying to figure out why this was pawned...can you hear my take on it? Food mutated in this city never goes bad. With such a rare item, who knows what high price it might fetch someday?