Cold Egg Salad

Ingredients

• 1 teaspoon dijon mustard/regular mustard (optional)
• 1/2 tsp lemon zest (grated zest)
• 1/2 teaspoon black pepper
• 1-2 spring onion greens chopped
• 1 tbsp coriander finely chopped
• salt to taste
• 3 hard-boiled eggs
• 1/2 cup plain non-fat greek yoghurt