1 Little Gem Lettuce, trimmed then quartered lengthways
1tbsp lighter than light mayonnaise
1tsp Dijon mustard (optional)
1 White baton / tiger baton, halved widthways
1 medium salad tomato, sliced into rounds
½ small ripe avocado, sliced (optional)
2 tsp capucine capers, drained
Heat a griddle or frying pan over a high heat. Rub or brush the steak on both sides with 1 tsp of olive oil: season. Place in the hot pan and cook for 2 ½-3 minutes each side for medium-rare. Transfer to a board, cover loosely with foil; leave to rest.
Toss the lettuce wedges with the remaining oil; season well. Return the pan to the heat; when hot, add the lettuce and sear for 30 seconds each side to lightly char. Transfer to a plate.
In a small bowl, mix the mayonnaise with the mustard (if using). Split the baguette halves and spread the base of each with he mustard-mayo. Add the tomatoes, avocado, and lettuce. Thinly slice the steak ab arrange on top. Scatter over the capers and sandwich together!