I didn't get a chance to vote during the challenge, sorry. I think the shot is very good technically. The DOF is ok, defining the look you were after as you said. The composition is good, the knife is carefully placed. If anything it looks a bit too "staged" if you see what I mean? There's no crumbs at all, the knife clean and polished. I agree with crabappl3, one or two jelly babies on the plate may have helped the idea along a bit?
Also, I'm no expert on lighting, not by any stretch of the imagination, but it seems a bit dull or flat, whatever the expression should be. I do know that the right light can make a or break a shot, I'm not saying it broken this one but it seems to lack some lustre, if that makes any sense and was of any help then you're welcome, if not then forget it, if you like it the way it is then that's what counts.
Very well done studio shot. May be a bit hot under the plate drawing my eye away from the sandwiches, but overall nice. The composition is strong and compliments the idea. It's hard to make out that these are gummie bears though. Did you try adding one or two on the plate to bring the idea across more? Good shot. - 6