Chubby Hubby - Lamb burgers with herbed yoghurt

Ingredients

• 1kg minced lamb
• 1 small onion, rough chopped
• 12g fresh ginger, peeled
• 15g garlic
• 20g fresh coriander, stalks and leaves
• 2-3 green chillies, seeds removed and chopped
• 1 1/2 tsp cumin powder
• 3 tsp garam masala
• 1 1/2 tsp salt
• 1 large egg
• 1/2 cup panko or bread crumbs
• 300ml Greek-style thick yoghurt
• 30g fresh coriander leaves, chopped fine
• 15g fresh mint, chopped fine
• 1 green chilli, seeds removed and chopped fine
• salt, to taste
• 1 tsp freshly ground black pepper
• 14 small buns or 8 normal size hamburger buns
• lettuce leaves
• plum tomatoes
• 1 large onion, sauteed in olive oil over moderate heat until soft