Smoked Mackerel, Beetroot & Couscous Salad with Horseradish Dressing - Ainsley Harriott

Ingredients

• 1-2 packets of Ainsley Tomato & Chilli or Sundried Tomato & Garlic Couscous
• 2 spring onions, trimmed and sliced
• 1 large stick of celery, trimmed and sliced
• 150-200g ready cooked beetroot (not in vinegar), sliced or diced
• 2-4 fillets of smoked peppered mackerel, broken into bite pieces (skin removed & checked for bones)
• 1-2 handfuls of watercress or wild rocket
• olive oil, for drizzling
• ½ lemon for squeezing
• 3-4 tbsp half fat sour cream or crème fraiche
• 2-4 tsp creamed horseradish or grated fresh
• 1-2 tsp chopped fresh dill, plus extra to serve
• ½ lemon, zest & juice to taste