What is the meaning of [A dish fit for the gods]

An offering of high quality.
From Shakespeare’s Julius Caesar, 1601:

BRUTUS:

Our course will seem too bloody, Caius Cassius,
To cut the head off and then hack the limbs,
Like wrath in death and envy afterwards;
For Antony is but a limb of Caesar:
Let us be sacrificers, but not butchers, Caius.
We all stand up against the spirit of Caesar;
And in the spirit of men there is no blood:
O, that we then could come by Caesar’s spirit,
And not dismember Caesar! But, alas,
Caesar must bleed for it! And, gentle friends,
Let’s kill him boldly, but not wrathfully;
Let’s carve him as a dish fit for the gods…