In a medium saucepan, over high heat, bring chicken broth to a boil. Remove from heat and stir in couscous. Cover and let sit for 5 minutes.
Squeeze excess water out of thawed spinach. Semi Homemaker Tip: use potato ricer to squeeze water from spinach - Carol Simmons, Orland Park, IL.
In a microwave-safe bowl, combine spinach and black beans. Heat, covered, in microwave on HIGH for 2 minutes.
Stir spinach and black bean mixture into couscous. Add lemon juice and season, to taste, with salt and pepper.