In a large mixing bowl, mix the melted butter with the garlic, salt and pepper.

Rub the beef generously with the spice mixture.

Place in the fridge for 10 minutes to allow it to marinate.

When ready to cook, preheat the oven for 430°F (220°C).

Place the roast beef in a baking dish and pour the water into the dish. Bake for about 20 minutes* and baste occasionally with the pan juices.

Remove the roast beef from the oven and cover the dish with tin foil or a lid to let the meat rest for 5 minutes before serving.

After moving the roast beef to a serving plate, move the meat juices that were in the roasting tray into a small saucepan on the stove.

In a small bowl, place the flour along with a tablespoon of water and mix to make a roux.

Mix the roux in to the saucepan and let the mixture come together for 5 minutes until it starts to thicken.

Serve warm alongside the roast beef.