Combine apple cider vinegar, lemon juice, Dijon mustard, sugar, salt & pepper in a bowl.
Whisk until smooth and evenly incorporated.
Slowly whisk in canola oil and continue to stir until oil is fully emulsified.
Combine kale, Brussel sprouts, cabbage, sunflower seeds, feta and superfood crunch dressing into a large stainless-steel bowl.
Toss thoroughly to combine; making sure the dressing has coated all of the lettuce.