Stuffed with what, it really matters little. Do a crab dip type thing, spinach, bacon or pancetta, or this: lots of herbs with breadcrumbs, onion, and the scooped-out squash sauteed first. Sprinkle cheese on top before roasting, or not. Or stuff it with “surprise,” what happened to that fun tradition? The object is using the summer squash — particularly the rounder species, like these lovely eight-ball varieties just in season — in ways we haven’t before.