Serves 6 INGREDIENTS 2 tablespoons extra virgin olive oil 1 medium onion, chopped 4 garlic cloves, chopped fine 1 (1-inch) piece fresh ginger, peeled and grated 1½ teaspoons garam masala 1½ teaspoons curry powder 1 pound sweet potatoes, peeled and cut into ½-inch cubes 4 cups vegetable broth 1 cup yellow lentils 1 fresh bay…