Foi Thong and Thong Yib (Golden Egg Threads and Pinched Sweets)

Thompson is specific about this historical lineage — he considers the Portuguese-Thai connection one of the most important and underdocumented influences in the development of the Thai sweet tradition. Egg-yolk-based sweets (fios de ovos in Portuguese, foi thong in Thai) are found wherever Portuguese traders and missionaries settled: Brazil, Macau, Japan (tamago somen), Cambodia, Vietnam, and Thailand. The shared ancestry across five countries is one of the more remarkable cases of culinary migration.

Two preparations from the Portuguese-influenced Thai court dessert tradition: foi thong — golden egg yolk threads, formed by drizzling beaten yolk through a fine-nozzled funnel or cone in spiralling patterns into simmering sugar syrup; and thong yib — small, pinched egg-yolk sweets cooked in the same syrup and formed into a lotus petal shape by pinching with the fingertips. Both preparations belong to the category of court sweets (khanom thai) whose origins Thompson traces to Maria Guyomar de Pinha, a Japanese-Portuguese woman who became the consort of the Greek adventurer Constantine Phaulkon at the Siamese court of King Narai (1656–1688) and is credited by Thai culinary tradition with introducing the egg-yolk-and-sugar sweet preparations of Portuguese colonial confectionery to the Thai court kitchen.

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