Method
Step 1
Preparation: Prepare all ingredients as indicated above.
Step 2
Onion caper marmalade: Place a pan on medium-high heat and add some olive oil (½ tbsp for 1). Add the onions and capers and cook for 3-4 minutes before adding the balsamic vinegar (be careful of any splashing hot oil). Cook another minute until slightly reduced.
Step 3
Salad: Assemble the sliced tomatoes, bocconcini balls and basil leaves. Season with salt and pepper and add a drizzle of olive oil.
Step 4
Steak: Place a dry pan on high heat. Rub both sides of the steak with olive oil and when the pan is hot, add the steak. Sear for 1-1½ minutes a side, only turning once, for a medium-rare steak. If you would like to rest the steak, cover in tin foil and rest for up to 5 minutes. Using a very sharp knife, slice the steak against the grain: this means cutting across (and not parallel to) the long parallel muscle fibres in the meat creating short fibres in each piece and delivering tender slices of meat.
Step 5
Serve by topping the steak slices with the onion caper marmalade. Serve the salad on the side and add a squeeze of lemon juice.