Pour sugar into a saucepan, add honey and put on a slow fire.
Stir until the sugar dissolves . While stirring, add cinnamon, a pinch of salt and baking powder. Add margarine and keep on fire until completely dissolved. You can add vanilla if you want.
Remove from the heat, after 5 minutes add 200 g of flour, knead with a spatula until smooth. Then add 1 egg and mix. Then gradually pour in the rest of the flour and knead a very nice, soft dough. The amount of flour may be a little more or a little less.
Divide the dough into several parts to make it easier to roll out. Using cookie cutters, squeeze out different shapes. Place them on a baking sheet lined with parchment paper and bake at 180 degrees until golden brown (10-12 minutes).
Now we proceed to a very important part - the preparation of protein glaze for decorating gingerbread. Put the protein (I had it weighed 35 g) in a bowl, add powdered sugar. First, just mix, and then whisk at the lowest speed for a few minutes, until thickened. Add lemon juice (it will thicken the glaze) and whisk for a couple more minutes. Transfer to a deep bowl. The thickness of the glaze should look something like this:
Now, with the help of boiled and cooled water, we bring our glaze to a slightly more liquid state so that it is easier to apply it to gingerbread. Add a little water to the glaze and mix thoroughly with a spatula until smooth. As a result, the glaze should not become very liquid, but should "drain" from the blade.
Put the glaze in a pastry bag, cut off the tip slightly and decorate our gingerbread. You can also decorate with a sprinkle of dough.