Heat oven to 240C/220C fan/gas 9.
Rub the beef all over with the oil and
season with some salt and lots of black
pepper. Transfer to a roasting tray and
cook for 20 mins, then turn the oven
to 190C/170C fan/gas 5 and roast for
a further 10-15 mins per 450g for
medium-rare, 15-20 mins per 450g
for medium, 20-25 mins for medium-well
and 25-30 mins for well done. Remove
from the oven and allow to cool.
To make the salsa verde, mix all the
ingredients with some salt and pepper.
Thinly slice the beef and arrange on a
serving platter, drizzle with the salsa
verde and rocket leaves and eat with
the crusty bread.