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Heat the oven to 180C/160C fan/gas 4. Put a chopping board on your work surface. Snap or carefully chop the stalks off the ends of the green beans. Cut any thick stems of broccoli in half lengthways. Cut the root ends and about 2cm off the green tops of the spring onions, then cut each onion into 3 batons.
Fill a large saucepan halfway with water, put it on the hob and turn the heat on to medium-high until the water boils. Carefully tip the prepared vegetables into the pan of boiling water and simmer for 1 min. Put a colander in the sink and carefully tip the veggies and water into it.
Find a large baking tray (ours was 30cm x 40cm). Tip the cooked veggies into the tray and drizzle with 2 tsp olive oil. Season with a pinch of salt and toss through the oil until well coated.
Push the veggies to the edge of the tray, making space in the middle, then lay the salmon, with the skin side down, in that space. Drizzle the remaining 1 tsp oil over the salmon and season with a pinch of salt.
In a bowl, measure 3 tbsp mango chutney, 2 tsp soy sauce and 1 tsp ginger purée, and mix the ingredients together to make a sauce. Pour half the sauce over the veg and salmon.
Use oven gloves to carefully put the tray on the middle shelf of the oven. Cook for 15 mins.
Carefully remove the tray from the oven using the oven gloves and pour the rest of the sauce over the salmon. Return to the oven for another 5 mins. Pick the coriander leaves and scatter these over the salmon and veg. Serve with cooked noodles or rice.