Police in Chatham, Ont., have charged a woman with assault after her boyfriend was punched twice — the first time in an alleged dispute over a sandwich.

Investigators say a man made his girlfriend a sandwich Monday evening and when she only ate half, she said he could have the other half.

A short time later, police say the woman became infuriated that the sandwich was missing and punched her boyfriend in the face.

Police say later in the night the two became involved in an unrelated argument and she punched him in the chest.

A 27-year-old Chatham woman has been charged with two counts of assault.

She has been held in custody pending a bail hearing.