"May be prepared in 45 minutes or less but requires additional unattended time...."
INGREDIENTS
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2 large onions (about 1 1/2 pounds), sliced thin
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2 tablespoons olive oil
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butter pastry dough for a single-crust 12-inch tart
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1/2 pound Jack or Gruyère cheese, shredded (about 2 cups)
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1/2 pound plum tomatoes cut into 1/2-inch wedges
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1/2 pound medium yellow tomatoes (about 2) or 1/2 pound plumtomatoes, cut into 1/2-inch wedges
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1/4 cup Niçoise olives, pitted