Steak Frites with Garlic Mayo

6-8oz (168-224g) beef steak of choice - always well marbled

1 large baking potato

2 tbsp olive oil

1/4 cup of light mayonnaise

1/4 small spring onion - finely diced

1/4 tsp mixed herbs

1/4 garlic clove - micro diced

Handful of salad leaves

Smear of your favourite mustard - wholegrain, dijon, French…

2-3 pinches of flakey salt