This is potato salad as it should be — warm, bright with vinegar, and utterly without mayonnaise. The hot onion dressing wilts the vegetables just enough while the potatoes drink up every drop of that tangy, flour-thickened liquid. I grow those crisp little radishes specifically for salads like this, their peppery bite cutting through the richness.
Boil the sliced potatoes in well-salted water until just tender, about 15 minutes. Drain and arrange in your serving bowl while still warm. (Keep the potatoes warm — they'll absorb the dressing better this way)
Scatter the sliced radishes and cucumber over the warm potatoes.
In a small skillet, melt the butter over medium heat. Add the chopped onion and cook until softened and golden, about 5 minutes.
Sprinkle the flour over the onions and stir constantly for 1 minute to cook out the raw flour taste.
Slowly whisk in the vinegar and water, stirring constantly until the mixture thickens to a light sauce consistency, about 2 minutes.
Pour the hot onion dressing over the potato mixture and gently fold everything together. Season generously with salt and pepper.
Serve warm or at room temperature. The flavors will deepen as it sits.
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