This is a good way to use flavored vinegars.
1. Grind 1/4 cup mustard seed finely. Combine it with 1 tablespoon dry mustard powder and 1/3 cup water and let stand, uncovered, for 1 to 4 hours, stirring occasionally.
2. Process the mustard mixture, 1/3 cup herbal vinegar, 1 tablespoon corn syrup, 1 teaspoon sugar, 1 teaspoon salt, and 1/8 teaspoon ground cloves in a blender until smooth.
3. Pour boiling water over 4 tablespoons snipped fresh chives, drain immediately, and stir them into the mustard. Transfer the mustard to a clean jar and cap it. It will be ready to eat in about 3 days.