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1
Scoop avocado flesh into bowl, reserving one stone.
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2
Using fork, gently mash avocado until chunky-smooth texture remains; do not over-work.
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3
Fold in minced onion, serrano, jalapeño, and coriander; season with lime juice, salt, pepper, and cumin.
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4
Place reserved avocado stone in centre of guacamole to prevent browning; cover with cling film directly on surface.
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5
Serve immediately with warm tortilla chips and lime wedges.