Do you really have to boil cannonball lettuce before eating it?

Today I went to look at the lettuce at the grocery store, and it cost more money than a Big Mac or Whopper and they had a cheaper variety of lettuce called the cannonball lettuce, but I was told you have to boil cannonball lettuce for over an hour before you can eat it. Also you can't boil too much at once because if you do, the wait time might be up to 2 hours or more.

Do you really have to boil cannonball lettuce before eating it?
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