How do you punctuate zeugma?

How do you punctuate an elliptical sentence structure?

1) Paul ate the tuna casserole; Mary, the taco salad.

OR

2) Paul ate the tuna casserole, Mary the taco salad.

I’m feeling frustrated that I’m coming across many published examples that I find confusing to read! (via jobby’s shared items in Google Reader)

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