| 1 | In a small saucepan over low heat, melt 100 g  butter, then remove from heat and add 50 g  cream and 2 tablespoons  Calvados (apple liqueur), stir and set aside. |  | 
| 2 | In the bowl of a mixer, sift 125 g  flour, add 125 g  caster sugar, 2 g  salt, 4  eggs and 15 g  yeast. |  | 
| 3 | Start the mixer on low speed to blend well. |  | 
| 4 | Drizzle in the butter, cream and calvados mixture without stopping the mixer. |  | 
| 5 | Mix well. |  | 
| 6 | Increase the mixer speed, and let the dough beat for 10 minutes. 
 Note: This is an essential step if you then want a light, airy cake.
 |  | 
| 7 | Pour the dough into a buttered high-sided tin, cover with cling film or plastic sheeting, and leave to stand in a warm place for around 2 hours. |  | 
| 8 | At the end of this time, you'll see that the dough has pushed through. |  | 
| 9 | Preheat your oven to 180°C (360°F) and bake for 25-30 minutes. |  | 
| 10 | Unmould as soon as you remove from the oven, otherwise the cake will stick to the tin, and leave to cool on a wire rack. |  | 
If using semi-salted butter, do not add salt at rstp=2.
The Saint-Lô cake recipe is said to have been invented by a local restaurateur called "Le père Féret", chef of the Marignan restaurant.
 are very important. If you don't do this (as in many recipes on the web), you'll end up with a dense cake that won't taste as good.