Tape the contrasting label directly over the canned food label.
Make sure no part of the true contents are showing. I used a Green bean label and covered over a can of pears.
I asked the children if they liked green beans.
Most said they did not, I elaborated on this issue and afterward I proceeded to open the "Green Beans" what they found on the inside of the can was sweet and juicy and delicious and wasn't at all what they were expecting.
I then told the children just because something or someone is different looking on the outside doesn't mean what's inside isn't worth getting to know and enjoy. We shouldn't "label" others wrongfully just because they seem different.