Chewy, tangy-sweet, and comforting, sweet and sour pork is arguably the best known, most-loved dish in Americanized Chinese restaurant repertoire. You begin by marinated pieces of tenderloin with soy sauce, rice vinegar, ginger, and a modest twist: Asian fish sauce. Separately, make the sweet and sour sauce (water, more vinegar, ketchup, sugar, and some potato starch for thickening). Assemble a simple potato-starch batter, then deep-fry each of the elements (batter-coated pork, fresh pineapple, and vegetables), one by one. Finally, assemble all the elements in a wok or large frying pan until everything’s cooked, glossy, and delicious. Steamed white or brown rice is an essential accompaniment.