Brush a baking sheet with butter or margarine. Sift the flour in a bowl and make a hole in the Center. Crumble the yeast and Knead together with milk and a little flour. Leave to ferment the dough prior 15 minutes.
Melt the butter, mix with the egg, salt and sugar and work together with the rest of the flour until you get a dry sourdough. Let ferment others 15 minutes.
Divide the dough into pieces of 50 g and, with floured hands, form balls. Do with balls a few strips 50 cm long, thread onto spiral, form a circle and close it with a knot.
Place the nests on the oven tray, paint them with beaten egg yolk and lay an egg in the center of each. Leave to ferment 10 minutes.
Heat oven to 210 degrees. Cook the nests 15-20 the average height of the oven minutes. Paint with watercolours or crayons once cooked eggs.
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