This is Chinese in origin, but adapted to Thai cooking. This recipe is from a seasoning packet, as many westerners seem to be cautious with using these. This is straight forward and easy. And keep in mind, the Lobo brand packet has two packets inside for making this dish twice, cost savings right there. This packet is available in the US at most Asian markets. This is a very nice, mild flavor, the red is not from chili powder.
Pork loin would cost about 75 Baht/600 grams. For 4 servings, this is about 56 cents per serving.