Shrimp and Crab Rolls Creole Style

Ingredients

• 1-1/2 pounds (26–30 count) shrimp, peeled and deveined
• 1 pound lump crabmeat
• 1/2 cup mayonnaise
• 2 tbsps fresh lemon juice
• 2 tsp chopped tarragon
• 1/2 tsp Creole mustard, optional
• 1/4 cup finely minced celery
• 1/4 cup finely minced red bell pepper
• kosher salt and freshly ground black pepper to taste
• granulated garlic to taste
• 6 top-split hot dog buns
• 2 tbsps salted butter, softened
• 1-1/2 tbsps chopped fresh chives, divided