1. In a large pot, heat the oil over moderately low heat. Add the onion and cook, stirring occasionally, until translucent, about 5 minutes. Increase the heat to moderately high. Add the mushrooms and cook, stirring occasionally, until golden, about 5 minutes. Stir in the garlic and the soy sauce.
2. Add the lentils, salt, and water to the pot. Bring to a boil. Reduce the heat and simmer, partially covered, stirring occasionally, until the lentils are tender, 25 to 30 minutes.
3. Stir the turkey, pepper, and 1/4 cup of the parsley into the soup. Top each serving with some of the remaining 1 1/2 tablespoons parsley.
Try two cups of diced cooked chicken or ham instead of the turkey.
Wine Recommendation: Zinfandel is the one truly American red, so why not serve it with our native bird? It's more than poetic license: Turkey's strong, gamy flavor, and the earthy lentils as well, requires a robust and fruity wine.