Ingredients:
- 3 stalks celery, thinly sliced on the diagonal
- 1 fennel bulb – trimmed, cored and thinly sliced
- 1/3 red onion, thinly sliced
- 1 tablespoon chopped fresh parsley
- 1 lemon, juiced
- 2 tablespoons olive oil, or more to taste
- salt and ground black pepper to taste
