Poached Salmon Salad Sandwiches

Ingredients

• 4 cups water
• 3 slices lemon
• 1 slice onion
• pinch pepper
• 400 g salmon ((about 4 small fillets))
• 2 tbsp red onion (diced)
• 3 tbsp fresh dill
• 1 tbsp lemon juice
• 1/3 cup low-fat plain yogurt
• 1 tsp horseradish
• 8 slices multi-grain bread
• 1 cucumber (sliced)