"In 'Slow Cooker: The Best Cookbook Ever' by Diane Phillips..."
INGREDIENTS
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3 tablespoons extra-virgin olive oil
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1 large onion, coarsely chopped
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2 garlic cloves, minced
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3 medium carrots, coarsely chopped
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6 stalks celery, with leaves, coarsely chopped
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2 teaspoons dried sage (or 2 whole fresh sage leaves, finely chopped)
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1 (14 1/2 ounce) can chopped plum tomatoes, drained
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2 cups brown lentils
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6 cups vegetable broth
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salt
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fresh ground black pepper