Add the chipotle, oil and garlic to a bowl, then mix well until fully combined. Marinate in the fridge for at least 1 hour, then remove from the fridge at least 30 minutes before cooking.

Add the guacamole ingredients to a bowl, then mix well until fully combined.

Bring a pan to medium heat, then toast each tortilla for 1 minute on each side.

Remove the tortillas from the pan, then add the steak and cook for 3 minutes on each side for medium-rare.

Remove the steak from the pan, rest for 4 to 5 minutes, then slice into cubes.

Add the guacamole to each taco, then top with the steak, tomatoes and a drizzle of mayo.