Shave the Brussels sprouts by trimming the ends and halving them. With the cut side down, make thin slices with your knife across the Brussels sprout to shred.
Add Brussels sprouts, chives, olive oil, lemon zest, and lemon juice in a large mixing bowl. Lightly mix the ingredients.
Add in the bacon, walnuts, parmesan cheese, and season to taste with salt, pepper, and chili flakes.
Notes
You can top it with extra parmesan once served.
Pancetta can be used instead of bacon or removed for a vegetarian option.