Keema pie

Name: Keema pie
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: Asian, Indian
Ingredients: Cooking spray; 400g minced beef; 1 onion, peeled and diced; 2 Bell peppers, deseeded and diced; 2 carrots, peeled and diced; 1cm piece of root ginger, peeled and grated; 2 tsp garlic granules; 2 tbsp curry powder; 3 tbsp tomato puree; 450ml beef stock, 2 beef stock cubes dissolved in 450ml boiling water; 0.5 lemon, juice only; Pinch salt; Pinch black pepper; 150g frozen peas; 500g maris piper potatoes; 250g sweet potato; 0.25 tsp ground turmeric; 0.5 tsp Black onion seeds