Mighty mackerel with mixed tomato & quinoa salad

INGREDIENTS

• 1 mug (300g) quinoa
• ½ lemon
• 800 g ripe mixed-colour tomatoes
• 1 fresh red chilli
• 2 tablespoons extra virgin olive oil
• 1 tablespoon balsamic vinegar
• 4 x 200 g whole mackerel, scaled and gutted, from
• , ask your fishmonger
• 1 heaped teaspoon ground coriander
• olive oil
• 2 sprigs fresh rosemary
• 2 cloves of garlic
• 2 heaped tablespoons fat-free natural yoghurt
• 2 heaped teaspoons jarred grated horseradish
• a couple of sprigs of fresh basil