Toss the cucumber with the vinegar and sugar, and leave while you prep the burgers.
Put the cauliflower stalk-end down on a chopping board. Trim the ends off 2 sides of the cauliflower then cut the remainder into 2cm slices through the root to make 4 ‘steaks’ (you can freeze the leftovers for soup or cauliflower cheese). Trim them down slightly if they’re much bigger than the size of the buns.
Divide the spices equally between the flour and breadcrumbs in 2 shallow bowls. Dust each cauli steak in the flour. Dip in the beaten egg then coat in the breadcrumbs. Heat 1cm deep of oil in a large frying pan. Cook the steaks on a medium heat for about 5 minutes each side until crisp, golden and tender.
To build the burgers, spread the top and bottom of each bun with hummus. Add a few rocket leaves then a slice of pepper. Top with the cauli steak and some drained pickled cucumber, and some hot sauce, if using. Put on the tops and serve.
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