Galettes de Memère (Ginger Molasses Cookies)

Every day after school I would cross the single road that ran through my home village from the school yard to my grandmother's house - an apartment built on the top floor of an old house owned by a second cousin. She would always have a snack (une collation) for me, usually a glass of milk and some cookies. Most often, these were the cookies she made. As is common with so many grandmothers of my generation, her recipe was "a smidgeon of this" and "mix in the usual way" kind of instructions. It took me a while to figure out how to make them, and now I make them regularly, usually for special occasions.

1 cup Blackstrap molasses
1 cup brown sugar
1 cup (8oz/225gr) lard or butter
1 tsp baking soda
1 tsp ginger powder
1 tsp salt
½ cup boiling water
3¾ cup flour

1. In a mixer bowl, whip together the molasses, brown sugar and butter until it turns pale.
2. In a separate bowl, combine the baking soda, the dry ginger, salt and flour.
3. When the butter mixture starts to go pale, slow the speed to the slowest! It suddenly and unexpectedly splashes everywhere as soon as you add the the boiling water if the beaters are going too fast. 
4. Mix thoroughly, then slowly add the dry mixture until combined.
5. Cover and refrigerate overnight.
6. Roll into balls (1 oz each), set on cookie sheets and flatten slightly.
7. Cook in 350°F oven for 10 to 12 minutes.