Trim the leafy tops of the radishes, but leave a little bit of stem--it looks nice. Halve the radishes, or quarter them if they are really big. Put them in a nonreactive container with a tight-fitting lid. Bring 3/4 cup water, the vinegar, sugar, salt and ginger if using to a boil over high heat, stirring occasionally. Pour over the radishes, making sure the liquid covers them completely. Cool 10 to 15 minutes, and then cover and refrigerate at least overnight before eating. Press down the radishes into the liquid after 3 hours.
When you are ready to eat the radishes, whisk 2 teaspoons miso into the mayonnaise. Dip in a cold radish and taste--if you don't taste the miso, add the remaining teaspoon. Serve immediately.
The 6th Ingredient: A few pieces peeled chopped ginger boiled with the pickling liquid.
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