This is also fantastic with prawns or chicken instead of the beef. You can make up a big batch of the dressing and keep it in the fridge for up to 3 days.
Heat the coconut oil in a frying pan over a high heat.
Season the steak all over with salt and pepper. When the oil has melted and is hot , carefully lay the steak in the pan and fry for 2 minutes on each side.When the steak has had its time ,transfer it to a plate and leave to rest for 2 minutes.
While the steak is cooking,make a dressing by mixing together the fish sauce, lime juice, lemongrass, chilli and sesame oil in a large bowl.Stir in the cucumber and spring onions, then leave to sit for 2 minutes.
When you are ready to eat, add the avocado, tomatoes and lettuce to the bowl with the dressing, cucumber and spring onions , and gently toss the whole lot together.
Pile up your salad on a plate, slice your steak and place lovingly on the salad, before finishing with the chopped peanuts and roughly torn coriander and mint.
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