Sadao (which has an English name of "Neem Flower") is a bitter, dark green vegetable. The flowers, leaves, stalks, fruits, roots and bark have medicinal properties. This recipe is typical for the way sadao is served in Thailand, as it's eaten with a sweet dipping sauce.
Mix palm sugar, tamarind juice and fish sauce over medium/low heat and stir until the sauce thickens. Transfer to a small serving bowl. Top this sauce with fried onion, fried garlic, and whole dried chile peppers.
Rinse sadao and put in a bowl, pour boiling water over the sadao and let sit for a few minutes, remove from water and serve with the sauce. It's also popular to serve this with fresh cilantro and grilled catfish or grilled shrimp.