Stir 1 ½ teaspoon active dry yeast and a teaspoon of granulated sugar into ½ cup lukewarm milk. Leave in a warm place for about 10-15 minutes until a bubbly foam appears on the surface of the milk.
Heat ½ stick unsalted butter in the microwave for 30 seconds until melted, but not hot. In a large mixing bowl, combine 2 cups all-purpose flour and ⅛ teaspoon salt. Add 1 egg yolk, the rest of ⅓ cup granulated sugar, 1 Tablespoon lemon zest, and melted butter. Finally, pour in the milk mixture with the activated yeast.
Make the dough: First, roughly mix all the ingredients in the bowl with a fork. Then transfer the mixture onto a work surface, keeping a small handful of flour aside. Use your hands to process the dough, kneading it thoroughly until it becomes smooth and elastic. This will take about five minutes, so be prepared for some physical effort! If the dough is too sticky, dip it in the reserved flour and continue working it in.
Return the dough to the bowl, cover it with plastic wrap, and place it in a warm spot to rise for about 1½ hours. The dough should nearly double in volume.
Knead the dough briefly with your hands and divide it into six equal parts. Roll each piece into a strand about one inch (2.5 cm) thick and nine to ten inches (22-25 cm) long.
Make a knot from the strand: Place one end of the strand over the center to create an opening. Push the same end through the hole so that a bit sticks out, forming the tail of the bird. Turn the knot over, and the other end will create the bird's head.
Now we have a knot (the bird's body) with the head side up on the work surface. Use the tines of a fork to flatten the tail and create decorative notches at the same time.
Carefully transfer the birds to a baking sheet lined with parchment paper. Stick two small raisins onto the sides of the head for eyes, pressing them firmly to prevent them from being pushed out as the dough rises. At the spot where the head touches the body, insert a small piece of almond deeply to form a beak.
Cover the birds with a clean tea towel and let them rise in a warm place for another hour. If the dough strands have deformed while shaping the birds, they will smooth out during this second rise.
Preheat the oven to
350 °F and set it to upper and lower heat. Brush the bird thoroughly with 1 egg white leftover from making the dough. Bake the birds for 15 minutes.