Cut the ends off the asparagus stalks. Then cut each into small bite-size pieces.
Cut onion in half and julienne each half into thin strips.
Julienne both the bell pepper pieces into thin strips.
Cut beef piece into thin, long strips. Then place into a mixing bowl.
Marinate the beef by adding in: Salt (few shakes), Black Pepper (few shakes), Mirim (1 Tablespoon), and Corn Starch Powder (1.5 Tablespoons). Mix it together with your hands.
Next, place the frying pan on a medium-high heat. Place oil in. Once it's hot, place the beef pieces in. Let the beef pieces cook on one side until they get brown. (Note: The beef pieces will stick to the pan due to the starch - its okay!). Use a wooden spoon or spatula to scrape them off and turn it over. Cook on other side until there is good browning on the meat pieces. Set aside.
Clean frying pan out. Then add some more oil back in. Place on a medium-high heat. Once it's hot, place in Minced Garlic (1 teaspoon!) and Onion Slices. Stir both around for 15 seconds. Then add-in the Bell Peppers and Asparagus. Stir everything around for 2 minutes until the asparagus gets cooked.
Finally add in the beef pieces. Stir it around. Now, add the seasoning in : Soy Sauce (2T), Mirim (1T), Sugar (1T), Salt (few shakes) and Black Pepper (few shakes). Stir it around and turn off the heat.
Garnish with Sesame Oil (½ teaspoon!) and Sesame Seeds (few shakes)
Serve with some hot rice. Bon Appetit!