Twice-Roasted Squash With Parmesan Butter

Place a rack in middle of oven; preheat to 300°. Prick squash all over with the point of a sharp paring knife and arrange on a foil-lined rimmed baking sheet. Roast until very tender (knife should slide easily through the flesh), about 3 hours. (For quicker cooking, roast at 425° for 1 hour.) Tear or cut squash in half and let sit until cool enough to handle.

Remove seeds from squash; discard. Scoop flesh into a medium bowl. Tear skin into 6 large (about 4x4") pieces and set aside on same baking sheet to be refilled later; discard any excess skin. Add Parmesan, butter, and lemon zest to bowl with flesh and mash together to combine; season with salt and pepper.

Carefully move rack to upper third of oven and increase oven temperature to 450°. Divide mashed squash mixture among reserved pieces of skin and roast until top of flesh is beginning to brown, 10–12 minutes.

Do Ahead: Whole squash can be roasted 4 days ahead. Keep intact and chill.

While squash is roasting, whisk lemon juice, vinegar, oil, and honey in a large bowl. Add scallions, grains, pumpkin seeds, and raisins to dressing and toss to coat.

Arrange squash on a platter and spoon grain mixture and dressing over. Top with shaved Parmesan.