Mix all the turkey burger ingredients (except the hoisin sauce) in a mixing bowl by hand or using an electric mixer. Occasionally, I prefer to use my KitchenAid stand mixer for this, as it’s super easy and less messy.
Divide the mixture into four and make four patties about 1/2 inch thick. Alternatively, use a burger maker to make 1/4-pounder-size burgers.
Heat 1-2 tablespoons olive oil in a skillet or pan on medium heat. Then, carefully place the burgers in the pan and sear them until golden brown and cooked through, about 5-6 minutes on each side. In fact, I highly recommend resisting the urge to fiddle with them and letting them develop a good crust before flipping.
Next, add a couple of teaspoons of hoisin sauce over each burger and brush the surface to coat. Then, flip them over and cook that side for a few minutes. Add more hoisin sauce on the flipped side and cook again until charred. It happens quite quickly, so you may need to lower the heat a bit. Serve inside lettuce wraps or ‘buns’.
Place each burger over cucumber slices on a bed of lettuce, top with sweet Thai chilli sauce and coleslaw.