Celery Salad

Name: Celery Salad
Prep time: 15 min
Total time: 15 min
Cuisine: American
Ingredients: 2 hearts of celery ((about 20 stalks, with leaves)); 1 medium red onion ((quartered and thinly sliced)); ½ cup extra-virgin olive oil; Finely grated zest and juice of 2 lemons; 2 tablespoons red wine vinegar; 2 tablespoons drained capers ((roughly chopped)); 1 teaspoon minced garlic; 1 teaspoon celery seed ((optional)); 1 tablespoon fresh oregano leaves; ¼ cup roughly chopped fresh parsley leaves; Kosher salt and freshly ground black pepper ((to taste)); Generous pinch red pepper flakes ((optional)); ¼ cup coarsely grated or shaved Parmesan cheese ((optional))