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 fresh 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 (1/4 stick), plus more for coating the baking dish
• 1/2 medium white onion, thinly sliced
• Salt
• Freshly ground black pepper

Description

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