Place kale in a large bowl. Scoop out flesh from avocados, and add to kale.
Use your hands to massage avocado into kale so that leaves are well coated. (When finished, you’ll probably want to lick your fingers. Go ahead! Just be sure you wash your hands before proceeding!)
Add tomatoes, lemon juice, basil, and salt. Stir well.
Sprinkle sunflower seed kernels and/or pepitas, on top of each serving, if desired.