In a small bowl, sprinkle yeast over 1/2 cup warm water. Let sit until frothy, about 10 minutes. Sprinkle with 1/2 teaspoon flour and let sit another 5 minutes.
In a large bowl, combine flour and salt. Pour oil and yeast mixture into the center. Stir until incorporated and slowly pour remaining water until a soft dough forms.
Knead the dough on a lightly floured surface until smooth and elastic, about 5 minutes. Place back in the large bowl, cover, and let rise until doubled, about 1 1/2 hours.
Preheat oven to 350 degrees F and set a side a large baking sheet.
Divide dough into 8 equal pieces. Form a piece into a ball and cover remaining pieces. Roll the ball into a 1/2 inch thick, 6-7 inch long oval. Place on baking sheet and brush with egg yolk. Sprinkle with caraway seeds. Repeat with remaining pieces.
Bake in preheated oven until golden brown, 20-25 minutes.