Healthy Green Goddess Tuna Sandwich

• 170 g (5oz) tuna drained. I always use tuna in oil but tuna in brine is lower in calories.
• ½ avocado
• 4 tbsp herbs I used fresh basil and chives but oregano, dill or parsley will also be delicious.
• 1 tbsp Greek yogurt
• 1 Jalapeño
• 1-2 tsp lemon juice/lime juice
• salt and black pepper to taste

For the sandwich

• 4 slices bread of your choice
• 1 cup greens rocket/arugula, baby spinach, watercress or lettuce.
• cucumber sliced