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