Heat the oven to 220ºC/190ºC fan/Gas 7.
Put the sweet potato pieces in a large roasting tin and drizzle with 3 tbsp of oil. Put the leeks in another tin and drizzle with 2 tbsp of oil. Roast both for 40 minutes, turning the potatoes halfway through.
Pour the wine over the leeks and gently stir. Lay the salmon on top, season and sprinkle the sesame seeds over the salmon.
Separate the tomatoes into small bunches, still on the vine, and add to the tin. Drizzle with the rest of the oil and return to the oven for 15 minutes until the salmon is tender. Serve with the sweet potato chips.
See more salmon recipes