Mix the red onion with the vinegar, sugar and a pinch of salt. Cover and leave to pickle for at least 1 hr or overnight. To prepare the prawns, mix the chipotle paste, honey, lime zest and juice and oil together, then toss in the prawns until they’re coated in the mixture.
Put the leftover rice in a large bowl and mix with the lime zest and juice, most of the spring onions and the kidney beans. Season lightly. Spoon the mixture into two shallow bowls.
Top the rice with the pickled red onions, spiced prawns, sweetcorn, sliced avocado, the remaining spring onions and tomatoes. Spoon the crème fraîche on top, then serve with the coriander and a sprinkling of chilli flakes, if you want it spicy. Serve the extra lime wedges on the side for squeezing over, if you like.
