Polenta With Mushroom Ragu with cornmeal

1 1/3 cups yellow cornmeal 1/2 teaspoon salt 4 cups water 1 tablespoon olive oil 2 cloves garlic , minced 2 sprigs thyme 1 rosemary sprig 6 1/2 cups shiitake[...]

1 large onion , chopped fine 4 garlic cloves , minced 1 teaspoon dried rosemary , crumbled or 2 teaspoons minced fresh rosemary or 2 teaspoons fresh thyme[...]