My son is 2½ years old and he eats as if someone is going to take his food away from him - although that has never happened. He stuffs his mouth and barely chews the food.
We've always told him to take small bites, then chew, then swallow. Sometimes he does this, sometimes he doesn't. Perhaps 2½ is too early but I expect that it should be possible.
The problem is not the meal size, but the mouthfuls. Any tips?