Honey Walnut Cake

Ingredients

• 8 ounces (2 sticks) unsalted butter or nondairy butter, plus more for the pan
• 4 cups walnut halves
• 1 cup sugar
• 2 cups water
• 1 cup light honey, such as acacia or wildflower
• 1 ½ teaspoons ground cinnamon
• ½ teaspoon kosher salt
• 2 ½ cups unbleached all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• ⅔ cup light honey, such as acacia or wildflower
• ⅓ cup water
• 2 teaspoons finely grated lemon zest
• ⅓ cup fresh lemon juice (from about 2 lemons)