Composition: Excellent composition. The placement of the strawberry in the frame moves the eye around the shot.
Color: Great colors that are well saturated.
Exposure and Lighting: Interesting lighting with few hotspots. Ideally I would go a with a bit smaller aperture (like f/4 maybe?) to get a little more of the chocolate in focus in front of the strawberry. The limited DOF does work well though for isolating the strawberry in the scene.
The border: Good use of a border to "contain" the shot. Its serves its purpose without being distracting
The challenge: Excellent choice of subject. Very unique and the shot really sells it.
Overall: Well done! Very little to do improve on this shot. As mentioned previously a slightly deeper DOF might help however that might be nitpicky.
To me this photo cries out for sharp focus from front to back - something it lacks. I love the idea and the composition though. The use of flash adds some nice texture to the strawberry, but it also left reflections throughout the image which distract from the overall photo.
I think you have a winner here, but it just needs some retooling - shoot with a tripod and no flash perhaps in a well lit area? Use a bounce flash?