Add 1/3rd of the butter and 1/3 of the olive oil to a large frying pan and place over a medium high heat. When the butter has melted, add the diced potatoes and fry until they have turned golden brown and softened. Taste and season with salt and pepper and toss to combine.
680 g potatoes, 42 g unsalted butter, 3 tbsp olive oil, salt, ground black pepper
Transfer the potatoes to a Pyrex (oven proof) dish and place in the oven to keep warm.
Add the next 1/3 of the unsalted butter and 1/3 of the olive oil to the pan and when hot, add the diced onion and season with salt and ground black pepper.
2 large onions, 42 g unsalted butter, 3 tbsp olive oil, salt, ground black pepper
Fry the onion until it turns golden brown and has also softened. Transfer to the same Pyrex dish as the potatoes and pop back into the oven to keep warm.
Add the last of the unsalted butter and olive oil to the frying pan and turn up the heat to high. When the butter has melted, add the diced beef and season with salt and ground black pepper. Fry the beef until it is browned on all sides yet has a hint of pink still inside.
900 g beef tenderloin, 42 g unsalted butter, 3 tbsp olive oil, salt, ground black pepper
Remove the Pyrex dish from the oven and add the beef and serve either with a raw egg or a poached egg. Sprinkle chopped parsley over as you serve and enjoy.
4 large eggs
Equipment
1 Frying Pan
1 Oven Proof Serving Dish
Notes
Note 1: The beef and the potatoes should ideally be diced/chopped to the same size to give the dish symmetry. Note 2: The unsalted butter and olive oil are shown as 42g and 3 tbsps. in the recipe respectively. These ingredients are however divided into 3 equal amount of 14g and 1 tbsp for each of the three stages of the dish.