Potato Pea Salad

Name: Potato Pea Salad
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 1 lb fingerling potatoes (or new potato); 2 cups fresh English peas ( Trader Joes has shucked peas); 1/2 cup chopped celery; 1 cup Italian parsley, chopped; 1/4 cup tarragon leaves, chopped; 4 scallions, chopped; 1 garlic clove, finely minced (optional); 1/3 cup olive oil; zest from one lemon, plus 1/8 cup lemon juice, more to taste; 1/2 tsp salt, more to taste; 1/2 teaspoon pepper; 1 tablespoon whole grain mustard; 1 tablespoon capers