In a small bowl, combine chicken broth and tamari.
In a second small bowl combine the cornstarch and water and mix well to combine.
Heat a large non-stick wok over medium-high heat, when hot add 1 teaspoon of the oil, then add the asparagus and cook until tender-crisp, about 3 to 4 minutes.
Add the garlic and ginger and cook until golden, about 1 minute. Set aside.
Increase the heat to high, then add 1 teaspoon of oil and half of the chicken and cook until browned and cooked through, about 4 minutes on each side.
Remove and set aside and repeat with the remaining oil and chicken. Set aside.
Add the soy sauce mixture; bring to a boil and cook about 1.5 minutes.
Add lemon juice and cornstarch mixture and stir well, when it simmers return the chicken and asparagus to the wok and mix well, remove from heat and serve.