Heat 1 teaspoon olive oil in a large saucepan set over medium heat. Add the barley and toast, stirring occasionally, about 3 minutes. Stir in the water.
Bring the water to a boil, reduce to a simmer, cover and cook until the barley is tender, 45 to 50 minutes. Drain and transfer the barley to a bowl.
In a medium bowl, toss together the shrimp, ½ teaspoon olive oil, salt, pepper and rosemary.
Lightly coat a large nonstick skillet with cooking spray and heat over medium-high heat. Cook the shrimp until just cooked through, 1½ to 2 minutes.
Mix the shrimp into the barley, along with the red and yellow bell pepper.
The Dressing:
In a small bowl, whisk together the balsamic vinegar, Dijon mustard and dried rosemary. While whisking, gradually pour in the olive oil until combined.
Add the dressing and parsley to the barley mixture and stir to combine. Serve.
Notes
Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the built-in recipe card calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.