First, boil your potatoes and drain. If large cut into slices or smaller chunks and allow to cool.
Steam or boil broccoli, drain and cool, cut into small bite-size pieces
While the potatoes and broccoli are cooking/cooling make the dressing, Simply place all the vinaigrette ingredients in a jamjar, bowl or jug. Shake/mix well.
Place salad leaves, beetroot, onions, tomatoes, broccoli and potatoes in a bowl, drizzle over a couple or so tablespoons of dressing, then sprinkle over the ground linseed and lightly combine.
Divide dressed salad between plates, top with fish and drizzle over a little more dressing and serve.