1. Simmer the new potatoes in salted water for 20 minutes or until the potatoes are tender to the touch. Drain and leave to cool.
2. Mix together all the dressing ingredients in a small bowl.
3. Cut the avocado in half and remove the stone, scoop out the flesh using a spoon and cut into 1cm cubes.
4. Thickly slice the new potatoes.
5. Arrange the salad between 4 glasses and top with Russian dressing and caviar.