For delicate, thin cucumber slices, use a mandoline—you'll find inexpensive, good-quality ones at Asian markets.
Sunset JUNE 2011
1. Bring 1 in. water to a boil in a saucepan. Set whole potatoes in a steamer basket and steam in pan, covered, until tender, 15 to 20 minutes. Cool in ice water, then pat dry.
2. Whisk yogurt, mayonnaise, dill, vinegar, salt, and pepper in a small bowl to combine.
3. Quarter potatoes and put in a large bowl. Add onion, cucumber, and half the dressing; gently stir to coat. Add more dressing if you like, or save to use as a dip.
Make ahead: Up to 2 days through step 2. Chill potatoes and dressing separately and slice cucumber just before serving.
Note: Nutritional analysis is per 1-cup serving using half the dressing.
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