Dissolve the yeast in the warm water. Stir in the lukewarm milk, sugar, salt, cardamom, 4 eggs, and enough flour to make a batter (approximately 2 cups). Beat until the dough is smooth and elastic. Add about 3 cups of the flour and beat well; the dough should be smooth and glossy in appearance. Add the melted butter or margarine, and stir well. Beat again until the dough looks glossy. Stir in the remaining flour until the dough is stiff.