Preheat oven to 450℉.
If your salmon has skin either clean or remove it. Pat salmon dry, cut into 4 equal portions and season with salt, pepper and oil. Lay on a baking tray (skin side down if it remains).
Place baking tray with salmon into the oven and cook for 12 minutes
Add olive oil to a small saucepan over medium-low, add onion and garlic and cook until softened.
Add blueberries, brown sugar and lemon juice to the saucepan. Increase heat until sauce is simmering, then reduce to low and allow to simmer for 10 minutes. Stir regularly to break up the blueberries.
Serve the blueberry sauce over the salmon, garnish with dill and pair with your favourite sides.