- Preheat grill over medium-high heat.
- In a large mixing bowl, whisk the flour, cornmeal, sugar, baking soda, cinnamon and salt. Stir in the mashed sweet potatoes, mixing well.
- In a separate bowl, whisk eggs, butter and honey until smooth. Whisk in the milk. Pour milk mixture into dry mixture, stirring to mix well.
- Pour batter into a greased cast iron skillet; set skillet on preheated grill. Close lid and cook until cornbread is golden, and a toothpick inserted into centre comes out clean, 30 to 40 minutes.
- Transfer cornbread in pan to a cooling rack; let stand at least 10 minutes before cutting into slices or pieces.
Tip: Serve warm with Honey Butter, if desired. To make, whip or beat equal parts softened unsalted butter and liquid honey until smooth.