Heat a griddle pan over a medium heat.
Rub fillet with oil and season.
Cook fillet until well browned and cooked to your liking. Set aside
Toss asparagus with a glug of oil.
Griddle for about 3 minutes, or until tender and slightly charred.
Thinly slice fillet and toss with baby spinach and feta.
Serve drizzled with your favourite dressing and crusty bread.