McDonald's investing $100 million to lure customers back to the fast food giant after E. coli outbreak

McDonald's is investing $100 million to bring customers back to stores after an outbreak of E. coli food poisoning tied to onions on the fast-food giant's Quarter Pounder hamburgers.

The investments include $65 million that will go directly to the hardest-hit franchises, the company said.

The U.S. Centers for Disease Control and Prevention has said that slivered onions on the Quarter Pounders were the likely source of the E. coli. Taylor Farms in California recalled onions potentially linked to the outbreak.