Yes, I know it would be a sweet deal if it could easily be done, but think about cellulose and the structural parts of an apple. All the stacked cells offer a scaffold for cells to grow into whatever structure is required.
Andrew Pelling, Ph.D., an experimental biophysicist at the University of Ottawa, Canada, is interested in genetic and architectural controls of health and disease. Using different fruits for in vitro 3D cell culture in his Laboratory for Biophysical Manipulation, Pelling found that mammalian cells grow and expand into the structure provided (once the fruit cells were removed).
This type of research is being done elsewhere, but not with the basic materials found in the kitchen. Not only is it fun to think about, but a great chance to discuss STEM (science, engineering, technology, and mathematics) applications and careers with students. Plus, Dr. Pelling advocates "play" as a crucial part of inspiring his research. Go science!