Rinse and dry the Brussels sprouts. Slice off the woody end and discard. Cut the sprouts in half lengthwise. Lay the flat side of the sprout face down and then slice lengthwise into thin strips. Repeat with all of the sprouts. Alternatively, shred the Brussels sprouts on a wide grater.
Cut the raw bacon into small pieces. Heat a skillet over medium heat and fry the bacon pieces until crisp.
Transfer the bacon pieces to the bowl of sprouts. Reserve the bacon grease and pour into a mason jar.
Add the remaining ingredients to the mason jar. Tighten the lid and shake vigorously until the dressing has emulsified and become smooth. You can also do this in a food processor if desired.
Pour the dressing over the sprouts when ready to eat. Toss to coat.
Serve immediately. Garnish with extra bacon, if desired.