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Heat half the oil in a frying pan and add the sliced onions, the pepper and some seasoning. Cook on a low heat for 15 mins until the pepper is soft and the onions are caramelised.
Meanwhile, put the chilli flakes, garlic, fennel, mince and grated onion in a bowl. Whizz the bread ends into breadcrumbs and add those, too. Season and mix everything thoroughly. Heat a griddle pan and shape the meat mixture into 12 patties. Rub the patties with the remaining oil and griddle for 3-4 mins each side, or until cooked through.
Stir the ketchup into the onion mix, heat through, then spoon onto the baguette bottoms. Lay 3 patties on each, scatter with some lamb’s lettuce and top with the other half of baguette.