Drain on kitchen paper. For the pommes noisettes, use a melon baller to scoop out balls of the potatoes. Rinse in cold water, then put in a saucepan and cover in more cold water. Bring to the boil ...

When it begins to foam add in the sesame seeds. When the seeds start to take on colour, squeeze in the lemon juice. Serve the trout with the beurre noisette sauce poured over the top.