Divide the leftover risotto into two equal portions. Form each portion into a 3 inch wide cake.
Make an indentation in the top of each cake with your thumb. Put 1 tablespoon of cheese inside each indentation and carefully mold the risotto around the cheese. Firmly pat the cakes together so that they stick together, using damp hands to help the process along if necessary.
Beat egg in a shallow dish and transfer panko bread crumbs to a second shallow dish.
Coat each cake in egg and then in panko, pressing down on the crumbs so that they adhere to the cakes.
Pour enough oil into a small skillet so that it reaches a depth of about ¼ inch. Heat oil over medium heat. Add cakes to the pan and cook until golden brown and warmed through, about 4 minutes per side. Monitor the heat carefully and turn to down to medium-low if the cakes are browning too quickly. Transfer cakes to a paper towel lined plate and sprinkle with coarse salt. Serve with lemon wedges.
Calories: 309kcal | Carbohydrates: 43g | Protein: 12g | Fat: 9g | Saturated Fat: 5g | Cholesterol: 95mg | Sodium: 308mg | Potassium: 99mg | Fiber: 1g | Sugar: 1g | Vitamin A: 236IU | Calcium: 143mg | Iron: 3mg