Very finely chop the tops of radishes and leeks thoroughly washed from sand. Chop dill. Melt 2/3 of the butter in a skillet, add the leeks and simmer over low heat, stirring frequently, until soft, 7 to 10 minutes.
Add tops, simmer another 3-4 minutes. Put the dill, simmer for 1 minute, pour in the remaining oil, melt it and remove from heat.
Cool greens, peel and finely chop, mix with herbs, salt and use for pies or pies.