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Prepare pie crust according to package directions. Press into 9-inch tart pan with removable bottom. Trim edges. Prick bottom and sides of crust with tines of fork. Bake in preheated 400 F oven until light golden brown (10-12 minutes). Cool slightly.
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Core tomatoes; slice into 12 (1/4-inch) slices, reserving end slices from each tomato. Arrange 1/4-inch slices on paper toweling; sprinkle with 3/4 teaspoon kosher salt. Let stand for 10 minutes. Pat dry slices. Coarsely chop end slices of tomatoes; drain.
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In small bowl, combine chopped tomatoes with remaining 1/4 teaspoon kosher salt, 1 teaspoon bread dipper and 1/2 teaspoon oregano; spoon over bottom of crust.
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Arrange tomato slices alternately with mozzarella slices, overlapping slightly. Brush 2 tablespoons bread dipper over tomato and cheese slices; sprinkle with pepper. Bake until cheese is melted and lightly browned (25-30 minutes).
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Sprinkle with remaining 2 1/2 teaspoons oregano. Let stand 5 to 10 minutes. Brush with remaining 1 tablespoon bread dipper. Serve warm or at room temperature. Cover for transporting.