Rub the salmon flesh (but not the skin) with the five spice, a drizzle of oil and a good pinch of sea salt and black pepper. Heat a non-stick frying pan over a medium heat and place the salmon skin-side down in the pan and cook for 8 to 9 minutes or until nearly cooked through and the skin is crispy. Flip them over, immediately remove from the heat and allow to finish cooking through in the residual heat. Save a few coriander sprigs to one side, then pick and finely chop the remaining coriander and the mint leaves. Combine with the yoghurt, and season to taste. Using a speed-peeler, peel the cucumber into ribbons and place in a bowl. Peel and finely slice the shallots and chilli, then add to the bowl. Sprinkle over the vinegar, sugar and a pinch of salt, and mix with your hands to combine the flavours. Place a tortilla on each plate and flake over the salmon fillets, including any crispy skin. Add a dollop of the herby yoghurt, the minty cucumber (squeezing out any liquid) and pick over the reserved coriander leaves. Roll up and enjoy.