In a large bowl mix together garlic, lime juice and olive oil. Add diced red onion, tomatoes, red chilli, baby spinach, coriander and seasoning. Gently fold to combine.
Mash avocadoes roughly with a fork and add to bowl. Gently mix everything to give a rustic look.
If serving later, sit the avocado stone in with the guacamole and store in an air-tight container, preferably glass, to stop the avocado turning brown. Chill until required.
Just before service top guacamole with the crumble mix. Best served on the day it’s made.