4 teaspoons red wine vinegar |
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1/4 teaspoon salt, plus more for seasoning |
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1/8 teaspoon freshly ground black pepper, plus more for seasoning |
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3 tablespoons extra-virgin olive oil |
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2 cups finely chopped romaine lettuce (from 1/2 head) |
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2 cups finely chopped radicchio (from 1/2 large head) |
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1/2 cup drained canned white beans, rinsed and patted dry |
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8 oil-packed sun-dried tomato halves, drained and chopped |
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1/2 cup mozzarella, cubed |
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