Trim the ends of the okra and remove the calyx. Rub with 1/2 tsp salt, rinse under water, and pat dry. Cut into diagonal quarters. Peel and cut the potato into quarter slices, then slice into 5mm thick pieces. Soak in water for 5 minutes, drain, and microwave for 3 minutes at 600W. Drain again.

In a bowl, mix the sauce ingredients (sake, mirin, miso, and sesame seeds) until well combined.

Heat salad oil in a frying pan over medium heat. Add the ground meat and grated garlic, and stir-fry until the meat changes color.