Clean and devein shrimp. Shell on and tail on. Pat dry with paper towels.
Peel and cut potatoes into matchsticks. Cut asparagus into 2" long length. Discard ends, set aside.
Smash garlic and chop green onions, divide white part from green part. Set aside.
Heat up work in high heat. Once hot, add about 2 Tbsp of oil. Next add potatoes and white part of green onions. Stir fry for about 2 minutes.
Combine asparagus and garlic and stir fry for about one minute. Add 1/2 tsp of salt & pinch of pepper at this point. Give it a stir.
Next pour oil into the center of the wok, then add shrimp. Add rest of salt, black pepper and stir fry for a minute. Then add mirin, sugar and soy sauce.
Stir fry everything for about 5 minutes or until shrimp is fully cooked. Shrimp should turn pink and middle should be firm.
Turn off heat and garnish with, sesame oil, sesame seed and spring onions. Let it rest in wok for 1-2 mins. Serve hot paired with rice.