Lamb Sandwiches Recipe

Name: Lamb Sandwiches Recipe
Ingredients: 8 slices crusty bread, ½-inch thick each; 1 large clove garlic, halved; Fine sea salt and freshly ground black pepper; ¼ cup mayonnaise; 1 large or 2 small celery root(s), peeled and julienned (about 1 pound); 1 tablespoon chopped fresh tarragon; 1 tablespoon minced fresh chives; 1 tablespoon minced shallots (1 medium shallot); 1 teaspoon fresh squeezed lemon juice (½ small lemon); 8 leaves Romaine or other crisp lettuce; 1 ½-2 pounds leftover cooked lamb, at room temperature, trimmed of fat and sliced thin