1Whisk together mustard powder and 1/4 cup of the Coors Light in a heat proof small bowl and let sit at room temperature for at least 30 minutes.
2Meanwhile, bring 1 inch of water to a simmer in a small pot.
3Add liquid smoke, garlic, cayenne, jalapeno, paprika, black pepper, and cumin to mustard mixture and whisk to combine.
4Place the bowl over the simmering water (the bowl shouldn’t touch the water) and cook, stirring frequently, until the mustard is slightly thickened and yellow-brown and the taste has mellowed a little, about 7 to 10 minutes.
5Whisk in remaining beer to thin out the mustard, cover, and immediately refrigerate.
6Keep refrigerated at least 24 hours before using.