Chilli mud crab

Ingredients

• 2 live mud crabs (about 1kg each)
• 6 kaffir lime leaves, torn
• 2 red birdseye chillies, thinly sliced
• Juice of 2 limes, or to taste
• 1 tbsp fish sauce, or to taste
• 1 egg, lightly beaten
• 1 bunch each coriander and Thai basil, coarsely torn
• 2 spring onions, thinly sliced
• Chilli jam
• 60 ml (¼ cup) vegetable oil
• 1 onion, finely chopped
• 5 garlic cloves, finely chopped
• 15 gm (3cm piece) each of galangal and ginger, finely grated
• 3 long red chillies, thinly sliced
• 80 gm light palm sugar, plus extra grated for seasoning
• 2 tbsp fish sauce, or to taste