China; Mid-Autumn Festival documented from the Tang Dynasty (618–907 CE); mooncakes as a festival food documented from the Song Dynasty (960–1279 CE); the salted duck egg yolk tradition is a Cantonese development.
Mooncake — the dense, filled pastry of the Mid-Autumn Festival (15th day of the 8th lunar month, typically September or October) — is one of the most symbolically important foods of the Chinese calendar, given as gifts to family, friends, and colleagues in the weeks surrounding the festival. The traditional Cantonese mooncake is a golden, baked pastry with an elaborate decorative impression on the surface (a stamp), filled with lotus seed paste and salted duck egg yolk — the yolk representing the full moon. The construction is deceptively simple but technically demanding: the pastry (made from golden syrup, lye water, and oil) must be wrapped precisely around the filling, which must itself be at exactly the right firmness, and the sealed pastry must be pressed into the wooden mould to produce the raised design before baking. Modern variations include snow skin mooncakes (a chilled, unbaked preparation) and flavours from black sesame to matcha to red bean.
The pastry: golden syrup (or molasses), lye water, and vegetable oil — no water; the high sugar and alkalinity produce the characteristic golden colour and chewy texture Filling must be firm enough to wrap — lotus paste that is too soft can't be wrapped without breaking through the pastry The pastry-to-filling ratio is typically 3:7 (pastry to filling by weight) — the thin pastry encasing a generous filling is traditional Rest the wrapped mooncake in the mould for 5 minutes before pressing — this settles the pastry and prevents air pockets Bake at 200°C, brush with egg wash, bake again at 180°C — the two-stage baking produces the characteristic golden lacquered surface Age 2–3 days after baking — the mooncake 'returns to oil' (hui you) as the oils from the lotus paste seep into the pastry, creating the characteristic glossy, slightly soft texture
The wooden stamp moulds produce the traditional raised patterns; plastic press moulds are available for home use and produce excellent results For the salted duck egg yolk: pierce the shell, remove the yolk and pre-bake at 150°C for 8 minutes — this partially cooks the yolk and removes the rawness that would affect the texture Snow skin mooncakes (no baking required) are an excellent starting project for those new to mooncake making — the chilled rice flour skin wrapped around chilled filling requires no baking
Filling too soft — it breaks through the pastry during wrapping; firm the filling in the fridge before using Pastry too thick — the ratio should be thin pastry around generous filling; thick pastry changes the eating experience significantly Not ageing — freshly baked mooncake has a dry, hard pastry; 2–3 days of resting allows the oils to redistribute Egg wash too early — the first bake must be done without egg wash to set the pastry; add egg wash only for the second bake Not pressing firmly into the mould — insufficient pressing produces an indistinct pattern on the surface