Steps:
- Toast the baguette slices and let them cool. Spread a generous layer of butter on each slice (you will need about 5 TBSP's), then lay the slices close together on a baking sheet and top with all but 1/2 cup of cheese. In a large saucepan, melt the remaining 4 TBSP butter over medium heat. Add the onions, season with salt and saute, stirring occasionally, until very soft and golden, about 15 minutes. In a 5 quart casseroe, arrange a layer of bread slices (about 1/3 fo them). Spread 1/3 of the onions on top, followed by 1/3 of the tomato puree. Repeat for 2 more layers. Sprinkle with the remainig 1/2 cup of cheese. To avoid voling over, the casserole must not be more than 2/3 full. In a saucepan, bring 1 1/2 quarts water to a boil. Add the salt. Very slowly pour the salted water into the casserole, near the edge so that the liquide rises just to the top layer of cheese without covering it. (Depending on the size of your casserole, you may need more or less water.) Preheat oven to 350F. Put the casserole on the stove and simmer uncovered for 30 minutes, then transfer to the oven and bake uncovered for 1 hour. The soup is ready when the surface looks like a crusty, golden cake and the inside is unctuous and so well blended that it is impossible to discern either cheese or onion. Each person is served some of the baked crust and some of the inside, which should be thick but not completely without liquid.
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