Nordic Shrimp Croissant Sandwiches

Name: Nordic Shrimp Croissant Sandwiches
Prep time: 15 min
Total time: 15 min
Cuisine: European
Ingredients: 3/4 lb (350 g) fresh or frozen Nordic shrimp, thawed; 1/2 green apple, diced; 1 green onion, finely chopped; 1 tsp chopped fresh tarragon; 3 tbsp (45 ml) mayonnaise; 4 croissants, halved horizontally; 4 leaves Boston lettuce; Salt and pepper