Lemon & Tarragon Chicken Salad Rolls

INGREDIENTS

1/2 cup

mayonnaise

1/4 cup

finely chopped shallots

2 tbsp

whole-grain mustard

2 tsp

lemon zest plus 1 tsp. juice (from about 1 large lemon)

1 lb

rotisserie chicken, meat cut into bite-size pieces (about 3 cups)

3/4 cup

thinly sliced celery, plus 2 tsp. chopped celery leaves

3 tbsp

chopped fresh flat-leaf parsley

1 tbsp

finely chopped fresh tarragon

2 tbsp

butter

potato hot dog buns

Torn butter lettuce