Smoked pork omelette with black mustard | Incredible Crete

Ingredients

• 1/2 kilo black mustard
• 1 cup kefalogravièra cheese, grated
• 7 eggs
• 1 cup smoked pork ham from the thigh
• 1/2 cup milk
• 1/2 cup olive oil
• 1 teaspoon butter
• Black pepper, freshly ground
• Salt