Creamy Tuna Sandwich

• 95 g tin tuna, drained
• 0.25 cup greek yoghurt
• 1 tsp lemon juice
• 2 small pickles, finely chopped
• 0.25 red onion, finely chopped
• 0.25 tsp everything but bagel seasoning
• 0.5 cucumber, thinly sliced
• 1 wholemeal bread roll