Chop and stirfry in a little oil. After a few minutes, add a bit of a sauce of either soy sauce and water (50/50) or a little rice vinegar, or any sauce you prefer, and cover... the sauce will steam the greens. Check every minute or so and stir... when they are bright green but the stems are tender, they're done. You can serve with grilled or baked chicken and rice, or toss the greens and sauce with some cooked vermicelli and tofu.