INGREDIENTS
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1/2 cup dried French green lentils, rinsed, drained, and picked over
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1 small red onion, halved
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3 tablespoons red-wine vinegar
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3/4 teaspoon Dijon mustard
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1/4 cup plus 2 tablespoons extra-virgin olive oil
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Coarse salt and freshly ground pepper
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4 ounces baby arugula (6 cups loosely packed)
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12 ounces cherry tomatoes, halved if large
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3 ounces goat cheese, crumbled