Old-Fashioned Apple Crisp

INGREDIENTS

• 1/2 pound cold unsalted butter, diced
• 1 teaspoon ground nutmeg
• 3/4 cup light brown sugar, packed
• 1/2 teaspoon kosher salt
• Grated zest of 1 lemon
• 3/4 cup granulated sugar
• 2 teaspoons ground cinnamon
• 2 tablespoons freshly squeezed orange juice
• 1 cup oatmeal
• 5 pounds McIntosh or Macoun apples
• Grated zest of 1 orange
• 1/2 cup granulated sugar
• 1 1/2 cups flour
• 2 tablespoons freshly squeezed lemon juice