I feel like its all about preventing the tantrum before it esculades.
I have a very dramatic, feisty, stubborn 3.5 yr old and I always try and prevent tantrums from happening by figuring out the "why" are they frustrated. It's still hard at this age for them to communicate properly and be pleasant all the time.
Ex: are they bored, hungry, thirsty, tired, misunderstood at the moment, in need of attention, in need of affection?
A 2 yr old cannot always say " mommy...