INGREDIENTS
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4 thick slices Italian bread, cut into cubes
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1/4 cup extra-virgin olive oil
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Kosher salt and freshly ground pepper
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1 tablespoon dijon mustard
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1 tablespoon fresh lemon juice
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2 tablespoons white wine vinegar
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2 pounds mixed heirloom tomatoes, cut into chunks
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1 bunch scallions, sliced
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2 tablespoons chopped fresh dill
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3/4 cup grated gruyere cheese
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1 tablespoon all-purpose flour