Homemade Rum Cake Recipe

INGREDIENTS

• :
• 1 cup chopped walnuts
• 1¾ cups all-purpose flour
• ¼ cup cornstarch
• 4 teaspoons baking powder
• 1 teaspoon kosher salt
• ½ cup unsalted butter, at room temperature
• 1½ cups granulated sugar
• 3 tablespoons + ½ cup canola oil, divided
• 1 cup
• (or one 3.4-ounce package of instant vanilla pudding)
• 4 eggs
• ¾ cup whole milk
• ¾ cup dark rum
• 1 tablespoon vanilla extract
• ¾ cup unsalted butter
• ¼ cup water
• Pinch of salt
• ½ cup dark rum