1. Remove the stems from the radish tops after washing them.
2. Peel the garlic, cut the clove into 4 pieces, and remove the germ.
3. Put all the ingredients in the bowl of a food processor or blender, and pulse until you get a smooth paste. You may need to scrape down the sides occasionally.
In a Companion, speeds 8 or 9 are perfect.
4. Add oil and pulse again to achieve your preferred consistency. (The mixture can also be made using a mortar and pestle; it's better for karma and triceps.)
5. Taste, adjust the seasoning, and pour into an airtight container, pressing it down firmly -- like a glass jar.