In a large bowl, dissolve yeast in warm water. Let stand for 5 minutes until foamy.
Add salt, olive oil, rosemary and gradually add the flour, mixing until a soft dough forms.
Turn the dough out onto a floured surface and knead for 5-7 minutes until smooth and elastic.
Place the dough in a greased bowl, turning to coat. Cover and let rise in a warm place for 1 hour, or until doubled in size.
Punch down the dough and divide it into 12 equal pieces. Roll each piece into a rope about 6 inches long. Tie each rope into a knot and place on a baking sheet lined with parchment paper.
Brush the knots with olive oil and sprinkle with mixed seeds. Let rise for another 20 minutes.
Preheat oven to 375°F (190°C). Bake for 20-25 minutes, or until golden brown.
Let cool slightly on a wire rack before serving.
Notes
Serve warm with butter or your favorite dipping sauce.