Ottolenghi Sweet Potato Shakshuka

Ingredients

• 1kg sweet potatoes, skin on and scrubbed clean
• 1 small red onion, thinly sliced into rounds (100g)
• 2 tbsp lemon juice
• 3 tbsp olive oil
• 150g mature cheddar, roughly grated
• 3 garlic cloves, crushed
• 1 tsp cumin seeds, roughly crushed with a pestle and mortar
• 8 medium eggs
• 25g unsalted butter
• ¾ tbsp sriracha
• 2 tbsp picked fresh coriander leaves, with some stem attached
• salt
• black pepper