Spicy jerk prawn & mango tacos

Use Caribbean-style jerk paste to marinade shellfish, then serve in crunchy corn tacos with a textured salad and light sauce

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300g raw peeled king prawns 1 1/2tbsp Jamaican jerk paste 400g can black beans, drained and rinsed 1 large mango, stoned, peeled and diced 1/2 red onion, sliced 1/2 cucumber, chopped Bunch coriander, leaves roughly chopped 8 taco shells 1/2 tbsp vegetable oil 2 Little Gem lettu