Blanch asparagus in boiling water with 1 tsp salt and 1 tsp oil for 3 minutes; set aside.
Blanch mushrooms for 1 minute; set aside.
In a small bowl, mix 1 tsp cornstarch with 1 tbsp water to make liquid starch.
Heat oil in a pan, add garlic, and stir until fragrant.
Add blanched asparagus, mushrooms, and red pepper.
Season with 1/3 tsp salt, 1/3 tsp sugar, 3 tsp soy sauce, and liquid starch.
Stir-fry over high heat, sprinkle with crushed black pepper. Serve and enjoy!