1In a bowl, mash avocado with juice until smooth. Stir in onion, coriander, chilli and season.
2Spoon into a shallow serving bowl, smoothing over top. Spoon runny sour cream into a snap-lock bag and snip a corner to make a small opening.
3Pipe circles on top of dip, starting from the centre. Use a toothpick to drag through circle to make a web pattern. Spoon tomato on the edge and place plastic spiders in the centre and on plate. Serve with corn chips.
TIP: Guacomole is best made when ready to serve as it can discolour.
Photo: Rob Shaw/bauersyndication.com.au