Easy Lentil Wellington

Name: Easy Lentil Wellington
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: British
Ingredients: 2 sheets gluten free puff pastry ((I use Jus-Rol pictured above)); 200 g chestnut mushrooms (finely chopped (2 cups)); 150 g pre-cooked chestnuts (finely chopped (1 cup) (see notes for other ideas)); 2 tbsp tamari ((30ml) (see notes for other ideas)); 2x 400 g cans of pre-cooked lentils (drained and rinsed (4 cups)); 2 garlic cloves (crushed); 2 tbsp gluten free & vegan gravy granules/powder ((see notes for other ideas)); 2 tsp dijon mustard; 1 tbsp tomato puree; large sprig rosemary (finely chopped); large sprig thyme (finely chopped); olive oil