the 'three stuffed treasures', refers to stuffed eggplant, stuffed bell pepper, stuffed bean curd
Definitions (粵典–words.hk)
名詞
廣東地區嘅地道小食，將啲魚肉分別釀入去茄子、紅腸、青椒之類食材入面，再用油煎炸 fried three treasures
Definitions (Wiktionary)
noun
three stuffed treasures (a common Cantonese street snack, traditionally consisting of eggplants, tofu and bell peppers stuffed with dace fish paste and fried)