I did just as Poor Miss Brown and baked my own crisp bread this Christmas, I also stole the heart shape, it looked so neat and all.
It turned out really well, a bit harder then the one you buy in the store but really tasty. Here comes the recipe from Poor Miss Brown (but translated of course)

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Crisp bread recipe
5 pints of Milk
50 g yeast
2 tsp salt
2 tsp optional bread spices (Aniseed is really tasty)
2 ½ cup coarse rye flour
2 ½ cup wheat flour

It is a bit hard translating a recipe from dl to cups, so one have to use a bit common sense when baking.

Warm the milk until it is approximately 100.4 F warm then crumble the yeast into the milk and stir until the yeast is dissolved.
Then add everything else, without any particular order, mix until it is a firm dough. Let it rise for half an hour.

Put the oven on 480 F
Bake out the dough really thin with a rolling pin and then punch out your breads. You can also make ordinary round breads, but hearts are so nice and cute.
This dough makes about 20 regular sized breads.

The breads are then baked in the oven for 8 minutes. Turn the breads over after half of the time to get them evenly baked on both sides.

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