Heat the oil in a saucepan t over medium-high heat.
Add onion and mushrooms; cook until onion is soft and mushrooms are golden, about 10 minutes.
Add the garlic and tomato paste, wine, thyme, salt and pepper. Cook for 2 minutes.
Add the broth, flour and tamari sauce to a cup, mix well so you have no flour lumps and pour into the saucepan with the rest of the sauce.
Simmer until mixture thickens, about 10 minutes.
Stir in the lentils and cook for another 2 minutes.
Serve with mashed potatoes. Place the lentil stew on top.
Garnish with fresh parsley