Bring the chicken stock to the boil. Pour over the couscous and let it soak for 5 minutes. Stir the couscous and let cool.
Peel the grapefruit and cut the flesh from between the skin. Squeeze out the remaining part and collect the juice.
Mix one teaspoon of honey with 1 tablespoon of grapefruit juice and 2 tablespoons of olive oil and mix into the couscous. Taste and season with salt and pepper.
Chop the flat-leaf parsley and mint and slice the spring onions. Peel the avocado and dice it.
Mix the couscous with the parsley, mint, spring onions, cranberries, grapefruit wedges and the avocado.
Slice the turkey and serve with the couscous salad.