Grilled Banana Pound Cake with Chocolate Sauce

Name: Grilled Banana Pound Cake with Chocolate Sauce
Ingredients: Nonstick cooking spray; 1 cup (2 sticks) unsalted butter, room temperature; 2 cups light brown sugar; 1 cup granulated sugar, plus more for dusting pan; 6 eggs; 1 1/4 cups mashed ripe banana (about 2 bananas); 1 1/2 teaspoons vanilla extract; 1/2 teaspoon lemon extract; 1/2 teaspoon baking soda; 3 cups flour; 1 cup sour cream; Pinch of kosher salt; 1 1/3 cups heavy cream; 1 cup honey; 2/3 cup dark brown sugar; 1/2 cup Dutch-processed cocoa powder; 2 cups semisweet chocolate chips; Big pinch of salt; 4 tablespoons unsalted butter; Unsalted butter, melted, for serving