Per serving
After one taste of this sharp, spicy homemade mustard, you'll find that it's worth the time to make your own. You can grind it by hand with a mortar and pestle to get a nice chunky texture, or make it in a blender being careful to use a low speed so you don't crush the seeds.
Combine the port, vinegar, mustard seeds, shallots and garlic in a medium saucepan and bring to a simmer over low heat. Simmer for 30 minutes, stirring occasionally. Remove from the heat and set aside to cool.
Transfer the mustard seed mixture to a blender and add the chili powder, ginger, salt and mustard oil. With the blender running on low speed, add 1/2 cup water and blend, adding a little more water if the mustard is too thick. Add the olive oil in a slow, steady stream until well-blended.
Transfer to a bowl and stir in the tarragon.
Store in a tightly-covered container in the refrigerator for up to one week.
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