Preheat the oven to 220C/200C Fan/Gas 7 and line a small, shallow ovenproof dish with kitchen foil.
Place the salmon fillets into the dish, skin-side down, and brush generously with the hoisin sauce. Make sure the fillets are placed at least 5cm/2in apart from each other. Scatter the cherry tomatoes around them. Cook for 15 minutes, or until the salmon is cooked through.
Meanwhile, prepare the noodles. Half-fill a saucepan with water and bring to the boil. Add the noodles, return to the boil and cook for 1 minute, stirring to separate the strands. Add the broccoli and cook for 3 more minutes, stirring occasionally.
Divide the noodles and broccoli between four warmed plates. Top with the salmon fillets and scatter with the cherry tomatoes. Season with pepper and serve sprinkled with a little soy sauce, if using.
