Vegan shepherd's pie

Name: Vegan shepherd's pie
Cook time: 1 h 25 min
Total time: 1 h 25 min
Cuisine: British
Ingredients: 600 g Maris Piper potatoes; 600 g sweet potatoes; 40 g dairy-free margarine; 1 onion; 2 carrots; 3 cloves of garlic; 2 sticks of celery; 1 tablespoon coriander seeds; olive oil; ½ a bunch of fresh thyme; 350 g chestnut mushrooms; 12 sun-dried tomatoes; 2 tablespoons balsamic vinegar; vegan red wine; 100 ml organic vegetable stock; 1 x 400 g tin of lentils; 1 x 400 g tin of chickpeas; 5 sprigs of fresh flat-leaf parsley; 2 sprigs of fresh rosemary; 1 lemon; 30 g fresh breadcrumbs