Preheat the oven to 375 F. Grate the radishes on the large holes of a hand held grater; place on paper towels, and squeeze out the excess liquid. Combine radishes and butter in a small bowl; mix well. Add remaining ingredients and mix well. Slice baguette in half lengthwise, and place in oven; toast until crisp and browned. Remove from oven, and cool slightly. Spread radish mixture on toasted baguette; season with salt and pepper. Slice each half into four pieces, and serve. Makes 4 servings.
This spread is also delicious as an appetizer spooned into Belgian endive lettuce leaves, spread onto various flatbreads or as an aside to a grilled steak or salmon.