Defrost the edamame and remove the beans from the pods. Cut the potato into bite-sized pieces and rinse in water to remove excess starch.

Place the potato in a microwave-safe container, cover loosely with plastic wrap, and microwave at 600W for 4 minutes. Mash until smooth and mix in milk, butter, and salt and pepper. Add the edamame and mix well.

Divide the mashed potato mixture into 6 portions and shape each into a small oval. Lay two slices of pork in a cross pattern, place the mashed potato in the center, and wrap tightly.

Heat salad oil in a frying pan over medium heat. Place the pork rolls seam-side down and cook while turning occasionally until evenly browned.