- 500 ml of 3.5% fat milk
- 50 g butter
- 100 g flour (premium quality)
- 250 g fine powdered sugar (no, it cannot be replaced with granulated sugar)
- 1 tsp salt (if using fine salt, use slightly less)
- 1 large egg
- 3 large egg yolks (use the freshest eggs possible)
- 4 tsp vanilla extract
- 1/4 cup (62.5 ml) rum (light brown, not thick)