Not a south beacher right now, but I used to love a little natural peanut butter mixed in with plain greek yogurt and a bit of sweetner. My roommate looked at me like I had gone crazy when I was mixing it up, but after tasting it, she was a convert too
Once in phase 2, you can use it as a dip for apple slices, and it makes the peanut butter taste last soooo much longer for just a teaspoon or so -