Bring the milk to a boil with the vanilla pod. In a bowl, whisk the eggs and sugar vigorously until pale and frothy. Gradually add the flour and oil, mixing well. Slowly pour in the hot milk while whisking.
Preheat the oven to 180°C (gas mark 5).
Generously butter a high-sided mold, like a springform pan, and pour in the batter.
Bake until a knife inserted into the center comes out clean (about 25 minutes).
Mom's advice: This cherished family recipe keeps for days wrapped in aluminum foil in a cool place. Pairs perfectly with cream or custard.
Joëlle's view: Simple for home bakers, but oven quality affects timing – test yours.
