Ham and Potato Casserole

Ingredients

• 250 g (8 oz) ham, diced
• Olive oil, as required
• 1 medium onion, chopped finely
• 2 medium potatoes, peeled and diced
• 2 stalks celery, diced
• 375 ml (1 1/2 cups/ 150 g) Caciocavallo cheese, grated
• 6 eggs, beaten
• Salt and freshly ground pepper, to taste
• Sprigs of fresh thyme, to taste