Low carb grilled Mackerel with light Potato Salad

Ingredients

• 2 fresh or kiln roasted ready to eat mackerel
• 190g new potatoes such as Baby Jersey Royal, halved
• 150g tinned mixed beans, drained, rinsed
• 50g cucumber peeled & cut into cubes
• 1⁄2 bunch radishes (100g), sliced
• 1⁄2 small red onion, finely sliced & peeled
• 1⁄2 tbsp dill
• 2 tbsp light mayonnaise
• 1 tsp Dijon mustard
• 2 tbsp lemon juice
• Mixed herbs, to taste
• Black pepper, to taste