Wash all vegetables thoroughly and pat dry.
Remove tough stems from kale and broccoli and discard.
Finely chop the kale, broccoli, and cauliflower into bite-sized or grain-like pieces using a knife or food processor.
In a large mixing bowl, combine the chopped kale, broccoli, cauliflower, carrots, and red cabbage.
In a separate small bowl, whisk together the lemon juice, olive oil, tahini, honey, salt, and pepper until emulsified.
Pour the dressing over the vegetables and toss until evenly coated.
Sprinkle with sunflower seeds and pumpkin seeds before serving.