Celery and Red Onion Salad Recipe

Ingredients (6)

• 4 tablespoons olive oil
• 1 small red onion, thinly sliced
• 3 cups thinly sliced celery, include the leaves if they are attached to the stalks
• 3 tablespoons lemon juice
• 1/4 teaspoon salt
• 1/2 cup grated Parmigiano-Reggiano, or other hard cheese