It's a shame that Food52 neglected to provide instructions for this detail. They abandoned process photography years ago; that probably would have given a very simple clue.
Anyhow while I have never made this particular recipe I've made similar dishes. I'd bake the tomato caps on the same baking sheet alongside the stuffed tomatoes. The caps will likely be done before the stuffed tomatoes so I'd remove the caps early and set aside.
Another option would be to bake the caps on a separate smaller baking sheet.
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Anyhow while I have never made this particular recipe I've made similar dishes. I'd bake the tomato caps on the same baking sheet alongside the stuffed tomatoes. The caps will likely be done before the stuffed tomatoes so I'd remove the caps early and set aside.
Another option would be to bake the caps on a separate smaller baking sheet.
Anyhow best of luck.