Chipotle lime prawn burrito bowls

Name: Chipotle & lime prawn burrito bowls
Ingredients: 1 red onion, finely sliced; 2 tbsp apple cider vinegar; ½ tsp caster sugar; 250g leftover cooked rice; 1 lime, zested and juiced, plus extra lime wedges to serve (optional); 4 spring onions, finely sliced; 400g can kidney beans, drained and rinsed; 198g can sweetcorn, drained; 1 avocado, stoned, peeled and sliced; 2 large tomatoes, finely chopped; 2 tbsp low-fat crème fraîche; ½ small bunch of coriander, roughly chopped; ½ tsp chilli flakes (optional); 2 tsp chipotle paste; ½ tsp honey; 1 lime, zested and juiced; 1 tsp olive oil; 125g cooked king prawns