Chop or shred both cabbages into thin pieces. I used a mandolin. Can also use the food processor, a grater, or a knife.
Carrots: I buy them already shredded. If using whole carrots, grate them.
Slice the bell pepper into thin strips.
Toast the pepitas for a few minutes. Watch them -- they easily go from perfect to burnt!
Toss together the cabbages, carrots, bell pepper, and pepitas.
Whisk the lemon juice, salt, cumin, and garlic powder together, and pour over the salad. Mix well.