What Did Jill Biden Hand Over to President Biden?

There's lots of speculation over what first lady Dr. Jill Biden handed to her husband at a White House ceremony. The moment came just as President Biden was about to sign the Respect for Marriage Act in front of an enthusiastic crowd. Dr. Jill is seen reaching for something off-camera then she hands it to the president, who quickly pops it in his mouth. Biden seems to chew on it as he sits in preparation for the signing.