Crab and Avocado Tortillas

Ingredients

• 170g of white meat from a brown crab or spider crab
• 1 small red onion, sliced into thin rings
• Juice of 2 limes, plus wedges to serve
• Pinch caster sugar
• 2 spring onions, finely sliced
• 1 medium red chilli, deseeded and chopped
• 1 really ripe avocado, peeled, stoned and chopped
• 1 small garlic clove, crushed
• 2 corn tortillas
• Cooking spray oil