If you want to reduce stress levels, cook the steak first, it will benefit from extra resting. If you’re resilient, follow the instructions below.
Season the steak with salt and pepper. Core, top and tail the vegetables and cut the peppers and onion into eights, slice the aubergine and courgette into thickish strips and halve the mushrooms, if large. Place them all in a large bowl and drizzle generously with olive oil. Preheat a frying pan and the grill with no rack on it. Place the vegetables in the hot grill pan, season with salt and pepper and cook for 20 minutes, tossing around every now and then. Meanwhile, when the frying pan is smoking hot, set the timer for 4 minutes, place the steak in the pan and flip every 15 seconds. Remove and keep in a warm place, covered loosely with foil.
Mix the dressing for the veg with the mustard, balsamic, oil and lemon juice. When the vegetables are cooked, pour the dressing plus the resting juices from the steak over them and toss well. Slice the steak, divide the vegetables onto plates and drizzle with a little truffle oil. Place the steak slices on top of the vegetables and serve.
