What will you do if you toddler throws a tantrum in public places?

Toddlers throw temper because they are usually frustrated with something they are unable to voice out OR simply because they are not able to get what they want. Whenever my 3yo have a meltdown in public, i will first talk to him sternly telling him do not make a fool out of himself. So many people is looking at him. If he still refuses to listen and continue lying down on the floor screaming, I will carry him to a quiet place or corner of a mall. Hug him tight and try to calm him down. From there, slowly talk to him what have happened. Try to get him answer you, slowly explain why and give them a big hug after that.. Slowly, it definitely takes alot of paitence.