Finely dice the chicken breast and finely slice the spring onions, then place in a large bowl.Sprinkle over the curry powder and ground turmeric. Add the mayonnaise, crème fraîche, tomato ketchup, curry powder, apricot jam and lime juice and stir to combine. Season with salt and pepper.Roughly chop the coriander leaves. Add to the chicken mixture and stir to coat in the sauce.GarnishRemove the tops and tails from the mangetout and thinly slice on an angle.Slice the brioche buns lengthwise and set the tops aside. Scoop out the inside, being careful not to break the bun crust. Fill the scooped hole with the chicken mixture and top with a little mangetout, coconut chips and coriander leaves. Put the top bun on top and serve immediately.