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.
Garnish
Bring the reserved cooking water to a boil. Cook the butternut squash brunoise until soft, 3 - 5 minutes. Drain and keep warm.
Remove the tops and tails from the snow peas 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 snap peas, coconut chips and coriander leaves. Put the top bun on top and serve immediately.