실패 없는 연유카스테라 만들기/Perfect condensed milk Castella Recipe/soft sponge cake/カステラ

A successful way to make a soft, fluffy sponge cake(Castella). ingredient 30g of milk grape seed oil (scentless oil replaceable) 20g Vanilla Extract 6g Egg yolk 96g 30g of sugar Condensed milk 40g Egg whites 120g 80g of sugar 105g of flour