Potato, Tomato and Kofta Gratin with Pepper Sauce

Koftas

• 20 g fresh parsley cut in pieces
• 150 g spring onions cut in pieces
• 900 g lamb shoulder minced
• ½ tsp fine sea salt
• ½ tsp ground white pepper

Pepper Sauce

• 300 g onions quartered
• 150 g red peppers cut in pieces (3 cm)
• 20 g olive oil plus extra for greasing
• 400 g tinned whole peeled tomatoes in juice
• ½ tsp fine sea salt
• ½ tsp ground black pepper
• 400 g potatoes sliced (2-3 mm)
• 350 g tomatoes sliced (2-3 mm)