Its common to asked by someone "Have you eaten balut? Do you want to taste later?" It so easy to be tempted and eat later on. Because its hard to explain them scriptural principles regarding our basis for not eating fertilized duck egg.
Its important to let them know you are one of Jehovah's Witnesses. Their reaction? They might already know we don't eat or agree with blood transfusions. If they ask "why", you can remember Paul's word in Acts 15:29. He knows good health means to abstain in blood. You can show them fascinating scriptural basis of our belief. You can ask them to eat barbeque or cracklings instead.