Cook asparagus and oil in a skillet over medium heat for 3-4 minutes. When 1 minute remains, add garlic. Set asparagus and garlic aside.
Season chicken with salt & pepper. Increase heat to high and cook chicken until browned.
Set chicken aside and add soy sauce and chicken broth to skillet. Bring to boil for about 1 minute. And lemon juice, water, and corn starch and stir for about 1 minute.
Return chicken and asparagus to pan. Coat with sauce. Top with lemon zest.
Recipe by Rachel Schultz at https://rachelschultz.com/2014/04/07/lemony-chicken-stir-fry-asparagus/