Step 1

Heat a large frypan over a high heat, fry onions in 2 tbsp oil and fry until browned. Add ale and simmer until onions are soft and ale is reduced by half. Add sugar, vinegar, and simmer until soft and the liquid has reduced.

Step 2

Preheat BBQ grill plate to very hot, season steaks with sea salt, pepper, and rub with oil. Sear for 4 minutes on each side, allow to rest for 5 minutes before carving.

Step 3

Cut ciabatta bread in half, brush with oil, and grill on the cut sides.

Step 4

Spread aioli on each side, carve beef, and assemble in the sandwich with cheese, warm onions, and lettuce.