Step 1
Mix warm water, yeast, and 1 pinch of sugar in a large bowl, and let stand until the yeast begins to foam and form a creamy layer, about 5 minutes. Stir in milk, 1/3 cup sugar, salt, vanilla extract, eggs, and 1/3 cup vegetable oil until the sugar has dissolved. Mix in about half the whole-wheat flour, and stir until the dough is too stiff to add more flour. Turn the dough out onto a floured surface, and knead in more flour until the dough is no longer sticky. Knead until smooth and elastic, about 10 minutes. Form the dough into a ball, place into an oiled bowl, and cover. Let rise until the dough has doubled in size, about 1 hour.