INGREDIENTS
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1 tablespoon olive oil, plus more for serving
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1 medium onion, finely chopped (1 cup)
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1 tablespoon tomato paste
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1 teaspoon dried oregano
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1 teaspoon dried thyme
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1 cup lentils, picked over and rinsed
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1 can (14.5 ounces) diced tomatoes, in juice
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2 bunches (about 1 1/2 pounds total) Swiss chard, stalks cut crosswise into 1-inch pieces, leaves torn into 2-inch pieces (keep stalks and leaves separate)
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Coarse salt and ground pepper
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Juice of 1/2 lemon
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Bread, for serving (optional)