Soak your slices of gingerbread in the mixture for about 30 minutes
Cook the French toast
Heat a pan and melt a generous knob of butter (you can use salted or unsalted butter)
One the butter is melted, lay your slices of gingerbread in the pan and cook both sides until warm in the center and nicely caramelized on the outside
Add butter between each batch made.
Notes
The optional sugar can be used either in the egg-milk batter or in the pan with the butter. If you don't have enough egg-milk batter, add more with the ration of 1 egg for 20pml milk. Make sure to read the cooking notes in the articles to get more information.