Ingredients
- For the streusel:
- 1 cup panko
- 4 tablespoons unsalted butter (1/2 stick), melted
- 1/2 cup finely chopped walnuts
- 1 tablespoon finely chopped Italian parsley
- 1 1/2 teaspoons fresh thyme leaves
- 1 teaspoon kosher salt
- For the gratin:
- 1 1/4 cups heavy cream
- 1 medium butternut squash (about 3 pounds), peeled, cut in half, and seeded
- 1 medium celery root, also known as celeriac (about 1 pound), peeled and cut in half
- 2 tablespoons unsalted butter
- 1/2 medium white onion, thinly sliced
Description
In This Gratin, Layers Of Celery Root And Squash Are Bathed In Cream And Topped Off With Crunchy Walnut- And Thyme-studded Breadcrumbs. Unlike Most Gratins, This One Is Light And Tender, With A Little Crunch—a Crowd-pleasing Side.

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