Cut away the tough central ribs of curly kale before you chop or shred the leaves. For best results, either cook very briefly in a large volume of ready-boiling water or stir-fry as a side dish.
Transfer to a plate. Add the kale. Cook the garlic until fragrant, then add the chopped kale a few handfuls at a time until it starts to wilt. Add the remaining ingredients. Stir in the red onion ...