OAK BROOK, Ill.—McDonald’s Corp. says it will begin serving sliced tomatoes again after a multistate salmonella outbreak caused the world’s largest restaurant chain to yank the vegetable from its sandwiches.

Spokeswoman Danya Proud said Saturday that the fast food chain’s U.S. restaurants will reintroduce sliced tomatoes in the next seven to 10 days.

McDonald’s was among several restaurant chains and grocery stores that stopped serving sliced tomatoes last Monday as a precaution.

At least 228 illnesses in 23 states were linked to salmonella-tainted tomatoes.