Pour the beer into a wide skillet and bring to a simmer over medium high heat. Cook until reduced to 1 cup, about 15 minutes. Combine the reduced beer with the mustard seeds and vinegar in a bowl. Cover and refrigerate overnight.
The following day, add the sugar and spices to the mustard mixture and move to a blender. Process the mustard on high until smooth. Taste and season with salt. Move to an airtight container for long term storage. Refrigerate for at least 12 hours again before using.
Heat the oil in a large skillet over medium high heat. Once the oil is shimmering, add the hot dogs and cook until they burst, or at least blister, and remove them to paper towels to drain. Build the dogs by putting a wiener in each bun, topping with mustard and chopped onions. Bet you can’t eat just one!
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