Final answer:
If a food handler's finger begins to bleed and the blood gets on the onion while chopping onions, the food handler should bandage the finger and continue with proper food handling procedures.
Step-by-step explanation:
If a food handler's finger begins to bleed and the blood gets on the onion while chopping onions, the correct action would be to bandage the finger. Blood, if contaminated, can harbor bacteria and other pathogens, so it is important to prevent it from coming into contact with the food. The food handler should apply pressure to the wound to stop the bleeding, clean and bandage the finger, and then continue with proper food handling procedures.