Cumin is a Moorish legacy brought to Spain from North Africa. Prepare and refrigerate the dressing a day ahead. Toss with greens, onions, and tomatoes just before serving.
To prepare dressing, combine first 5 ingredients in a mortar or small bowl; grind with a pestle until mixture forms a smooth paste. Add vinegar and oil; stir with a whisk.
To prepare salad, combine escarole, tomatoes, and onion in a large bowl. Add dressing; toss well.
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