Polenta Casserole - With fruit

    This should be made in a dish you can put under the broiler, about 9 x 13 in. (sort of 23 x 33 cm if such a thing exists) 8 c. chicken stock (see[...]

2 teaspoons olive oil , divided 2 cups onions , chopped 3 cups cremini mushrooms , coarsely chopped 1 1/2 teaspoons salt , divided 2 cloves garlic , chopped[...]