Lobster Sliders

Ingredients

• Meat from a 1 1/2-pound cooked lobster (1 1/4 cups), cut into 1/2-inch pieces
• 2 tablespoons mayonnaise
• 2 tablespoons creme fraiche
• 1 tablespoon minced shallot
• 1 tablespoon finely diced dill pickle
• 2 tablespoons finely diced celery
• 1 1/2 teaspoons minced tarragon
• 1/2 teaspoon finely grated lemon zest
• Kosher salt and freshly ground white pepper
• 1 tablespoon unsalted butter, at room temperature
• Eight 2-inch round soft dinner rolls, split