Sardine Salad

Name: Sardine Salad
Cook time: 10 min
Total time: 10 min
Cuisine: American
Ingredients: 2 tablespoons finely chopped red onion or shallot (about 1/4 small red onion or 1/2 small shallot); 1 teaspoon grated lemon zest plus 3 tablespoons lemon juice (from 1 large lemon), plus more as needed; Kosher salt; 2 tins sardines packed in olive oil (about 4 ounces each); 1 tablespoon Dijon mustard; 1 large celery stalk, finely chopped; Black pepper; 2 tablespoons capers or chopped pepperoncini peppers or cornichons (optional); 1/4 cup dill or parsley leaves and tender stems (optional), chopped