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Heat oven to 220C/200C fan/gas 7. Toss the chips with 1 tsp oil and some seasoning. Tip onto a baking sheet and roast for 30 mins, turning halfway through. Mash the butter, mustard, capers and some seasoning together.
When the chips are halfway through cooking, rub the remaining oil into the steak and season. Heat a heavy-based ovenproof frying pan on a high heat. Sear the steak for 2-4 mins on each side (2 for rare, 4 for well done) and leave to rest, covered, on a plate.
Add the courgette to the steak pan and fry for 1 min, then add the tomatoes, and melt half the butter in the pan, spooning it over the veg. Transfer to the oven (if you don’t have an ovenproof pan, transfer to a baking tray), and roast on the shelf under the chips for 10 mins.
Serve the steak with the remaining butter on top and the veg and chips on the side.