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Mix the mince, Worcestershire sauce, breadcrumbs, half each of the coriander and onion, and some seasoning until combined. Form into 4 burgers, then chill until ready to cook.
To make the guacamole, mash the avocado with the remaining coriander and onion, the chilli and lime juice, and season.
Heat a griddle pan or barbecue until hot. Griddle the rolls, cut-side down, for 1 min, then keep warm. Brush the burgers with the oil to keep them from sticking. Cook for 7-8 mins on each side until charred and cooked through. Fill the rolls with the burgers, guacamole and peppadews.