Step 1

Boil, steam or microwave potato until tender, drain.

Step 2

Meanwhile, make dressing. Whisk ingredients in small bowl until combined.

Step 3

Melt butter in small frying pan, cook bread cubes over low heat, stirring, until browned lightly.

Step 4

Combine potato, celery, cornichons and dressing in large bowl, sprinkle with croutons.