Heat the oil in a large stockpot or dutch oven. Add onions, celery, turnip, potato and garlic and saute for about 5 minutes until everything softens slightly. Season with salt, pepper and thyme and cook about 2 minutes.
Add lentils, turmeric, ginger and cumin and saute 1 - 2 minutes, then add the broth and water. Bring the soup to a boil, cover and reduce to simmer for 30 minutes.
Remove from heat and stir in almond milk, spinach, herbs, lemon and pepper flakes until spinach has wilted. Serve immediately!