Thai Beef Salad Recipe

Ingredients:* 350gr beef fillet* salt and pepper* 1 tsp olive oil butter* 150 gr mix green salad* 1 big tomato, slice into small piece* 2 tb chopped mint leaf* 3 tb chopped coriander leaf* 1 spring onion,* 1 small shallot, thinly slicedsalad dressing:* 4 tb extra virgin olive oil* 1 tsp dijon mustard* 1 red