Christy Brissette, 80 Twenty Nutrition Mustard is more than just an optional hot dog addition. The mustard plant is a cousin to broccoli and kale, and contains some of the same compounds that may help prevent cancer. Parsley isn’t just plate filler, either. It’s an excellent source of antioxidants like vitamins A and C, as well as flavonoids, which help strengthen your immune system. Parsley can also help promote better digestion to help you get the most out of all the food you’re putting back. Try it on chicken breasts, white fish or pork tenderloin. Directions: Mix the ingredients in a small bowl.