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Cook the onions in half the butter over a medium to low heat for about 20 - 30 minutes, or until they have shrunk considerably and become sticky and golden.
Add the garlic towards the end and cook along with the onions for at least 5 minutes. Then add the Rajah Mild Masala Curry Powder and cook for a minute. Lastly, stir in the Worcestershire sauce.
Remove the pan from the heat and allow to cool to room temperature.
Tip the cooked onions into a small food processor and pulse until you have a rough paste. Alternatively, you can chop them manually with a sharp knife.
In a small bowl, combine the onion mixture, the remainder of the softened butter, the lemon zest and the origanum. Season to taste with salt and pepper.
To cook the steak, drizzle with olive oil and season well with salt and pepper.
Heat a pan (a griddle pan works well) to a high heat, add the steaks and cook for 5 minutes on one side. Turn them over and cook for another 5 minutes on the other side, or until done to your liking.
Serve the steak sliced, with a generous dollop of curry butter sauce, plus crushed roasted baby potatoes and a side of a rocket salad.