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)