Preheat oven to 375 degrees. Place walnuts on a tray and toast in oven until fragrant, about 8 minutes.
Let cool slightly. Finely chop, and set aside.
Whisk together vinegar, yoghurt, mustard, ½ teaspoon salt, and the toasted nuts in a small bowl and season with pepper.
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Add oil in a slow, steady stream, whisking until emulsified.
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Set dressing aside.
Boil & cube the potatoes and steam the french beans in a microwave with a little water till they are cooked or cook in boiling water for about 4 minutes until tender and bright green.
Prepare an ice - water bath and add french beans to stop the cooking process.
Arrange potatoes, ice lettuce and green beans in a bowl.