1. Stir the yeast, 1/2 cup of the flour, and 2 cups milk together in a large bowl. Cover and let rest in a warm place, 30 minutes
2. Add the remaining 2 1/4 cups flour, the egg yolks, warm milk, and salt to the yeast mixture and blend well
3. Beat the egg whites until they hold stiff peaks and fold them gently into the batter with a rubber spatula. Let rest covered in a warm place until doubled in bulk, about 1 hour
4. Heat 1/2 tsp clarified butter in a nonstick skillet over medium heat. Cook the blini 3 at a time if space permits. Spoon 1 tbs of batter per blini into the hot skillet and cook until lightly brown, 1-1 1/2 minutes. Turn and cook the other side until golden, about 1 minute or more. Remove to a plate and repeat with the rest of the batter. Add more butter to the skillet as necessary