These are a light zippy mash with a great tang from the vinegar.
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Drain, and then halve the potatoes. Pass them through a ricer or food mill (remove the skins as you go) back into the pan. Sprinkle the vinegar over the potatoes. Return the pan to low heat and fold in the warm milk. Fold in the butter a few bits at a time until fully incorporated. Season with salt. Fold in the dill. Serve hot.