Sripraphai is the only Thai restaurant, even serving up the one passable kai yang (barbecued Laotian chicken), where other places make it seem like poached fowl. Jungle curry (gaeng ba) is called such because it comes from the villages, where meat is scarce.Thus, veggies are almost exclusively used. Yes, bamboo and bean sprouts, but ESPECIALLY the tiny eggplants you find mainly in Southeast Asia.
The peppers are necessary. And are VERY hot. Bangkokians rarely eat gaeng ba. Asking whether you want jungle curry "spicy" is like asking if you want chocolate fudge cake "sweet."