Preparation Time: 10 minutes
Cooking Time: 0 minutes
Place haricot beans in a bowl.
Whisk the oil with the mustard and lemon zest and juice and season.
Drizzle half of the dressing over the beans. Gently toss to coat.
Divide the rocket between two serving dishes and then scatter with the beans.
Add chicken and tomatoes and then drizzle over remaining dressing.