In a bowl, toss the radishes with the dill. In another bowl, stir together the butter, lemon zest and pepper. Spread the lemon butter on one side of each bread slice; cover with radish mixture and sprinkle with salt. Using a 2 1/2 - 3 1/2 inch star-shaped cookie cutter, cut out the sandwiches. Refrigerate for 1 hour.
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