Thanks for all the suggestions everyone! We had been having it grilled a lot tossed with olive oil and S&P, but last night i sliced it up in a nice stir-fry and we had it over white rice.
a couple of more questions (hope its ok

) :
should i look for the thinner stalks or the large ones? i noticed that the last few bunches i bought they were small to medium sized stalks, but another bunch was actually quite large. i would say 1/2 to 3/4 of an inch wide at the base. I didn't grill the large ones i saved them for the stir-fry, which i then cut thin.
i am guessing a stringy texture is not good. Does that mean i overcooked them or are they old or something? i got a couple with the stringy texture both when grilled and stir-fried.