Sandwich with bacon

Hello, I really need your help. I’m trying to create bread and bacon/meat and sausages.
I used cycles and “alpha maps” (used the method described in blender nerd’s cylces alpha tut), but as you can see my bread doesn’t have edges.

I couldn’t figure out how to add a proper bread crust. I’ll keep on trying, but if any of you knows how to do this please tell me!

Any other critique is welcome too.

Here is the test render I made:

Okay, modeling is one way to do it! … I should have thought about that!

Okay, here is a little update:
this is going to be the character who will eat the sandwich. I’m planning to get him animated, but first I have to master rigging him.
There are still some other things on him which need to be fixed.