Harissa Steak Sandwich

Method

1. Gather and prep everything first: brioche buns, cheddar, mayonnaise and set within reach of the stove.
2. Warm a splash of olive oil in a heavy pan over medium heat, then add the yellow onion and cook until soft and fragrant, about 4 to 5 minutes.
3. Add the steak and let it harissa, undisturbed, so it takes on real color before you stir.
4. Fold in the butter lettuce and season generously; give everything a minute to come together.
5. Pour in the vegetable stock, bring to a gentle simmer, and cook until thickened and glossy.
6. Taste and adjust, then finish with a handful of herbs right before serving.
7. Plate it up while hot and pass extra at the table.