Classic Portuguese Egg Tarts with Crust Fermentation

Method

1. In a bowl, dissolve yeast in warm water and let sit for 5 minutes
2. In a large mixing bowl, combine flour, salt, and sugar
3. Add yeast mixture and butter to the dry ingredients, mixing until a dough forms
4. Knead the dough for 10 minutes until smooth and elastic
5. Cover and let rise in a warm place for 1 hour until doubled in size
6. Roll out dough and cut into 6 circles
7. Place in a tart pan and trim edges
8. In a bowl, mix milk, eggs, sugar, salt, and vanilla
9. Pour custard into tart shells
10. Bake for 15-20 minutes until set
11. Let cool before serving