We get curly kale. I just wash it and bung it into boiling water (same as for the sprouts) Four minutes maximum, then drain and add a knob of butter and a tiny sprinkling of salt. I do love green vegetables, simply cooked without any fancy sauce or farting about; my husband not so much, but I try and wind them into him for his health's sake. If not, he'd eat only white rice and his ferocious spicy horrors.