You understand perfectly: everyone got enough food to keep going, and they are equally dissatisfied with the result. I might take a step to the left by ordering known-unpalatable toppings and provide no further allocation instructions, but the effect is the same.

If there are 3 people, and they each get 2 slices, that is 6 slices.

So, throwing away 2 slices, because there is 8 total, is fine, as you stated that is everybody’s agreed minimum desired amount.

And there is no knife, nor protractor.

What is the difference between the worst and best compromise? If it is a compromise, it is a compromise.

Anti-compromise: A solution which pleases the fewest parties possible while still meeting each party’s needs.

Compromise: A solution which pleases the most parties possible while still meeting each party’s needs.