What about somebody cuts themselves while preparing food. They bleed on the food. Continue to cook it and serve it too people. If that blood is infected with anything. HPB or HIV. Is there any risk at all?
NO risk, no cases documented, not a chance, forget about it.
Diver is right and you should listen to him, The Body, Aidsmed and CDC are great sources of HIV Information, unlike *cough*cough yahoo for example.
You can not get hiv from food with blood traces. Every time you eat something you have blood traces very little but there are areas in your mouth that do tear. Also take into account the food eateries you may have been to in your life that may not have been the cleanest places, or utensils that may not have been properly washed, then take into account friends, relationships, family members that are hiv + and hiv - that share food, share utensils, common sense, no one has ever gotten HIV the way you described, and no one ever will. If they would, this disease would be pandemic, you are not going to be the first either, you have no risk of catching this disease the way you described.
Lot more info is available on transmission of HIV on the internet at some very reliable websites like The Body, Aidsmed and CDC. You need to upgrade your knowledge. HIV never transmit via oral intake of food (even infected with blood)