Poppyseed Biscuit

Name: Poppyseed Biscuit (Mákos Guba (Bobájka))
Yield: 6 servings
Cuisine: Hungary
Ingredients: 3 egg yolks; Pinch of salt; 1½ cups lukewarm milk; ½ envelope of yeast; ½ pound flour; 1 tablespoon plus ½ cup sugar; Flour for pastry board; 10 tablespoons melted sweet butter; 1-inch piece of vanilla bean; ½ tablespoon grated lemon rind; ½ pound poppyseeds, ground