Macaroni Salad with Dill and Ham

INGREDIENTS

• 2 tablespoons chopped fresh dill
• 1 tablespoon Dijon mustard
• 6 ounces cooked ham, cut into 1&3-inch cubes
• 1/4 medium red onion, minced
• 2 tablespoons white wine vinegar
• 1/3 cup extra-virgin olive oil
• 2 tablespoons milk
• 3/4 cup frozen baby peas, thawed (about 4 ounces)
• 1/3 cup sour cream
• 8 ounces elbow macaroni (about 2 cups)
• 2 ribs celery, with leaves, diced
• 2 teaspoons kosher salt, plus additional for salting water
• Freshly ground black pepper