Sweet Potato and Vegetable Tian

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1 red onion, cut vertically into sixths, sections separated

1 green bell pepper, cut into 1 1/2inch chunks

12 ounces mushrooms, large ones quartered, medium ones halved

2 plum tomatoes, cored and cut into sixths

3 mediumlarge sweet potatoes or yams, peeled, quartered lengthwise, and sliced 1/4inch thick

4 garlic cloves, thinly sliced

2 teaspoons chopped fresh rosemary, or 3/4 teaspoon crumbled dried

1/2 teaspoon salt

Generous seasoning freshly ground black pepper

1/3 cup olive oil

The topping:

3 slices homemadetype white bread

1 tablespoon olive oil