01 - Combine blueberries, balsamic vinegar, honey, lemon juice, Dijon mustard, salt, and pepper in a small saucepan. Bring to a simmer over medium heat, stirring occasionally, until blueberries burst and sauce thickens (8–10 minutes). Mash berries gently with a spoon. Remove from heat and strain if a smoother glaze is desired. Set aside.
02 - Preheat oven to 400°F. Pat salmon fillets dry and season both sides with salt and pepper. Heat olive oil in an oven-safe skillet over medium-high heat. Sear salmon fillets, flesh side down, for 2–3 minutes until golden. Flip fillets, brush generously with blueberry glaze, and transfer skillet to oven. Bake for 8–10 minutes, or until salmon flakes easily with a fork.
03 - Bring vegetable broth and olive oil to a boil in a medium saucepan. Stir in couscous, cover, and remove from heat. Let sit for 5 minutes. Fluff couscous with a fork and stir in lemon zest, lemon juice, parsley, dill (if using), salt, and pepper.
04 - Divide couscous among plates. Top each serving with a glazed salmon fillet. Spoon additional blueberry glaze over salmon, if desired. Garnish with extra herbs and lemon wedges.