I would do it with dulce de leche, which is easily made by boiling a can of sweetened condenced milk for 3 hours. Make sure the water level stays above the can or it can explode!)
No corn syrup! No unwrapping questionable carmels!
Or you could make your own carmel: check out:
http://www.davidlebovitz.com/archive..._for_ma_1.html
very labor intensive, but definitely yummy!