Dhruv Baker's harissa-spiced lamb burgers recipe

Ingredients

• 1 onion, finely chopped
• 2 tbsp vegetable oil
• 500 g British lamb mince
• 1 tbsp harissa
• 25 g pack fresh flat leaf parsley, finely chopped
• 1/2 cucumber, grated
• 200 ml Greek yoghurt
• 1/2 tsp caster sugar
• 1 tsp finely shredded mint leaves
• 1/2 lemon, juice and zest
• 1 pinch ground cumin