Heat the oil in a large deep-sided frying pan and fry the carrots, celery and onions over a medium heat for 8-10 mins until softened. Tip in the garlic, oregano and bouillon, then pour in 1 litre boiling water and the chopped tomatoes. Stir in the tomato purée, then cover and simmer for 10 mins.

Break in the spaghetti (snap it into about three lengths), tip in the beans along with the water from the can, and simmer for 10 mins more.

Stir in the chunks of salmon, then reduce the heat to low, cover and simmer for 5 mins.

Meanwhile, for the pesto, cook the broccoli in boiling water for 5 mins, then cool quickly in a bowl of cold water. Drain well, then return to the bowl and use a hand blender to blitz it with the basil, lemon juice and olive oil to make a thick pesto.

Ladle half the spaghetti mixture into two bowls and top with half the pesto. Scatter with some of the lemon zest, if you like, and a few basil leaves before serving. Cover and chill the remaining portions to serve another day. Will keep chilled for up to three days, or frozen for up to a month. Defrost thoroughly before reheating until piping hot.