Combine lentils, broth and water in a Dutch oven. Bring to a boil over high heat, reduce heat, cover, and simmer gently until the lentils are tender, but not mushy, 25 to 30 minutes (brown lentils take a little longer than green).
Meanwhile, heat oil in a large skillet over medium heat. Add carrots, onion, salt and pepper. Cook, stirring occasionally, until the vegetables begin to brown, about 15 minutes. Add garlic and cumin and cook, stirring constantly, for 30 seconds more. Remove from the heat.
When the lentils are tender, stir Cooked Wheat Berries and chard into the pot. Cover and simmer until the chard has wilted, about 5 minutes. Stir in the carrot mixture and lemon juice.
French green lentils are firmer than brown lentils and cook more quickly. They can be found in natural-foods stores and some supermarkets.