BAKED SWEET POTATOES WITH SMOKED MACKEREL

600g sweet potatoes • 1 tbsp white wine vinegar • 1 tsp honey • 100g radishes, trimmed and sliced • 230g pack boneless hot smoked mackerel fillets, skin removed • 2 tbsp fat free Greek natural strained yogurt • 3 salad onions, trimmed and sliced • Finely grated zest and juice of ½ lemon • 2 tbsp chopped dill • 130g pack watercress, rocket & spinach salad • 150g cucumber, cubed • 1 tbsp extra virgin olive oil