Best-ever Burgers with Spiced Onions

Ingredients

• 450g minced beef or lamb, with some fat on it
• 1 red onion, finely chopped
• 10g finely chopped root ginger (peeled weight)
• 2 large garlic cloves, finely grated
• ¾ tsp garam masala
• 1 free-range egg
• Salt
• freshly ground black pepper
• 6 burger buns or baps
• 1 large tomato, sliced crossways
• 3 large green chillies, stalks removed, pierced with the tip of a knife
• 2 rounded tbsps thick Greek yogurt
• 2 tbsp crème fraîche or mayonnaise
• Good handful of chopped coriander
• 1½ tbsp vegetable oil
• ½ tsp panch phoran spice blend
• 2 red onions, thinly sliced