Mushroom Gravy Pie with Garlicky Kale Mashed Potatoes

Name: Mushroom Gravy Pie with Garlicky Kale Mashed Potatoes
Prep time: 45 min
Cook time: 1 h 15 min
Total time: 2 h
Cuisine: American
Ingredients: 2 cups chopped kale, packed; ½ cup dry French lentils, rinsed; 1 ⅓ lbs (585 grams) Yukon Gold potatoes, peeled and chopped; 3 cloves garlic, peeled and divided; 3 tablespoons olive oil, divided; 4 tablespoons unsweetened non-dairy milk, divided; sea salt and ground black pepper, to taste; 1 small cooking onion, small dice; 2 tablespoons minced fresh hearty herbs (I used a mix of sage, thyme & rosemary); 2 ¼ lbs (1020 grams) mixed mushrooms, chopped; 2 tablespoons balsamic vinegar; 1 teaspoon gluten-free Tamari soy sauce; 1 teaspoon tomato paste; 1 cup vegetable stock; 1 tablespoon arrowroot powder