Lemon Asparagus Chicken Stirfry

Name: Lemon Asparagus Chicken Stirfry
Ingredients: 2 chicken breasts, cut into small 1/2 inch pieces; 1 cup asparagus, cut into small 2 inch pieces; 1 small onion, chopped; 1 garlic clove, minced; 2 Tbsp olive oil; 1 cup homemade chicken stock, or store bought chicken broth; 2 Tbsp fresh lemon juice; 1 tsp corn starch; zest from one lemon; parsley, chopped; cooked rice, enough for 4 servings.