Mix yeast and 1 teaspoon sugar in warm water to dissolve.
Let stand for 10 minutes.
In a large bowl, mix flours, ½ cup sugar, salt and rosemary.
Add the yeast mixture and the butter and stir to form dough.
Knead the dough on a floured surface until smooth (68 minutes).
Place dough in a lightly oiled bowl, brush with oil and cover with plastic wrap.
Let rise for about 1 hour. Preheat oven to 450° F.
Mix baking soda in water until dissolved.
Place dough on a floured surface and divide into 12 balls.
Roll each ball into a rope and twist into the shape of a pretzel.
Dip each pretzel into the baking soda solution and put onto a greased baking sheet.
Sprinkle each pretzel with salt and bake for 810 minutes or until golden brown.