*Choose avocados that are firm, with just a slight give. If the
avocado is soft enough to hold an indentation, it's overripe and
won't have the rich nutty flavor that you want for this salad.
Bring water to a boil in the bottom of a vegetable steamer. Cut
potatoes in half; place them in the steamer basket. Cover and steam
until they are cooked through, about 2 minutes. Remove the potatoes
from the heat and allow them to cool slightly.
While potatoes are cooking, whisk oil and vinegar together in a large
bowl. Season to taste with salt; set aside. When potatoes are cool
enough to handle without burning your fingers, cut them in 1" cubes.
Toss them in the oil and vinegar so they are coated well, and set
them aside to cool to room temperature, tossing occasionally.
In a small bowl, whisk together the sour cream, yogurt and
horseradish. Mince the dill and add it to the sour cream mixture,
stirring well.
When potatoes have cooled to room temperature, add celery and toss to
combine. Then add the sour cream mixture; toss again.
Halve, pit and peel the avocados. Cut them into 1 inch cubes; place in a
small bowl with the lime juice. Toss so the cubes are moistened with
the juice. Then add the avocados, with all of the lime juice, to the
potatoes; toss gently until they are well distributed and coated with
the dressing. Add pepper and additional salt to taste, and either
serve immediately or chill for 3 minutes and then serve.
Does not keep well for leftovers.
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