The cashew nut' leaves (daun janggus muda) above sure look like some kind of bettle. Young cashew nut leaves have very nice sweet aroma and are really tasty if made into ulam (Asian salad). You can eat them raw with sambal belacan or a more extreme way, with Otak Udang (Prawn paste, Har Ko, Heh Ko).
I used to pluck these leaves from the plant near my neighbour's house when I was a kid. Then, I would happily bring them home and after a quick wash, ate them raw with rice. However, the resin from the plant can stain your hands black, so better use a glove when you are plucking these leaves.